How to Prepare for GATE AG 2027: Syllabus, Strategy and a 14-Week Plan

AG is GATE's Agricultural Engineering paper. If your B.Tech had farm machinery workshops, a soil and water conservation lab and a post-harvest technology course, this is your paper. Its score counts for M.Tech, MS and PhD admission at the IITs, IISc, NITs and other institutes, and some public sector organisations look at GATE scores when they recruit.

AG is unusually spread out. One question may ask for the effective field capacity of a seed drill, the next for a unit hydrograph ordinate, and the one after that for the time to dry paddy from 22% to 14% moisture. Students who come from a single specialisation feel the gaps quickly.

All of this comes from gate2027.iitm.ac.in. Dates may move, so confirm them there.

Organising institute	IIT Madras
Exam dates	6, 7, 13, 14, 20 and 21 February 2027 (the date of the AG paper is set in the official schedule)
Result	19 March 2027
Mode	Computer-based test, English only
Duration	3 hours
Questions	65 (10 General Aptitude + 55 subject)
Marks	100: General Aptitude 15, subject 85 (including 13 marks of Engineering Mathematics)
Question types	MCQ, MSQ (multiple select) and NAT (numerical answer)
Negative marking	MCQ only: 1/3 for a 1-mark question, 2/3 for a 2-mark question
Calculator	On-screen virtual calculator in recent GATE exams; 2027 rules in the information brochure
Score validity	Three years from the date the result is announced
Two-paper option with AG	CE (Civil Engineering) is the only permitted second paper
Eligibility	Third-year or higher undergraduates, or graduates of a government-approved degree in engineering, technology, architecture, science, commerce, arts or humanities

The official eligibility page has the full table of qualifying degrees.

Seven sections make up the AG paper for 2027, with General Aptitude added as in every GATE paper. Keep the official AG syllabus PDF open beside you as a checklist.

Section 1: Engineering Mathematics

• Linear Algebra: matrices and determinants, linear and orthogonal transformations, Cayley-Hamilton theorem, eigenvalues and eigenvectors, linear equations
• Calculus: limits, continuity, partial derivatives, Euler's theorem on homogeneous functions, maxima and minima of several variables, series and convergence tests, Fourier, Taylor and Maclaurin series
• Vector Calculus: gradient, divergence and curl, line, surface and volume integrals, Stokes, Gauss and Green's theorems
• Differential Equations: first order and higher order linear ODEs, Laplace transforms, Laplace, heat and wave equations
• Probability and Statistics: mean, median, mode, standard deviation, binomial, Poisson and normal distributions, correlation and regression
• Numerical Methods: roots of equations, trapezoidal and Simpson's rules, numerical solution of ODEs

Section 2: Farm Machinery

• Machine Design: gears, pulleys, chains, sprockets and belts, overload safety devices, measurement of force, torque, speed and acceleration on shafts, couplings, keys, bearings and knuckle joints
• Farm Machinery: tillage and forces on tillage tools, hitching, equipment for sowing, planting, fertilizer application, spraying, harvesting and threshing, field capacity and efficiency, cost analysis, precision agriculture equipment

Section 3: Farm Power

• Sources of Power: human, animal, mechanical, electrical, wind, solar and biomass power, bio-fuels
• Farm Power: IC engine thermodynamics and cycles, fuels and combustion, lubricants, engine systems, performance curves, calculation of power, torque, fuel consumption and losses
• Tractors and Power Tillers: clutches, brakes, transmission, differential and PTO, chassis mechanics, traction theory, three-point hitches, steering and hydraulics, tractor testing, ergonomics and safety

Section 4: Soil and Water Conservation Engineering

• Fluid Mechanics: fluid properties, hydrostatics, continuity, Bernoulli, pipe flow with Darcy-Weisbach and Hazen-Williams, orifices, weirs and notches, open channels, dimensional analysis
• Soil Mechanics: index properties, permeability and seepage, shear strength, compaction and Proctor test, Mohr's circle, earth pressure, slope stability, Terzaghi's consolidation theory
• Hydrology: hydrological cycle, precipitation analysis, runoff, unit hydrograph, stream flow, flood routing, infiltration indices, drought
• Surveying and Levelling: chain, plane table and theodolite surveying, levelling, contouring, total station, GPS basics, areas and volumes
• Soil and Water Erosion: wind and water erosion, soil loss estimation, terraces, bunds, waterways, gully control structures, spillways, earthen dams
• Watershed Management: watershed characterisation, land capability classification, water budgeting, rainwater harvesting, check dams and farm ponds

Section 5: Irrigation and Drainage Engineering

• Soil-Water-Plant Relationship: crop water requirement, evapotranspiration, infiltration and soil moisture measurement
• Irrigation Water Conveyance and Application Methods: channel and pipeline design, scheduling, surface, sprinkler and micro irrigation, irrigation efficiencies
• Agricultural Drainage: drainage coefficient, surface and subsurface drainage design, leaching and salinity control, water quality and reuse
• Groundwater Hydrology: Darcy's law, flow in confined and unconfined aquifers, exploration, recharge estimation and artificial recharge
• Wells and Pumps: types of wells, steady flow to wells, well design, pump characteristics, selection and installation

Section 6: Agricultural Process Engineering

• Engineering properties of agriculture produce: physical, thermal, frictional, rheological and electrical properties
• Evaporation and Drying: evaporators and dryers, osmotic and freeze drying, drying and milling of cereals, pulses and oilseeds, drying kinetics, psychrometry
• Size Reduction and Material Handling: energy laws of size reduction, screening, conveyors, cleaning and grading, centrifugal separation, homogenisation, filtration and membranes
• Processing of Agriculture Produce: seeds, spices, fruits and vegetables, value addition
• Storage Systems: controlled and modified atmosphere storage, godowns, bins and silos, packaging

Section 7: Dairy and Food Engineering

• Heat and Mass Transfer: conduction, convection, radiation, transient conduction, heat exchangers, mass transfer, material and energy balances, water activity and sorption isotherms
• Unit operations in Dairy and Food engineering: blanching, homogenisation, pasteurisation, sterilisation
• Preservation of Food: microbial death kinetics, pasteurisation and sterilisation of milk, cooling, freezing, refrigeration and cold storage

Go through the PDF line by line at least once. Precision agriculture equipment, total station and GPS, and drought classification are easy to miss if you rely on a senior's old checklist.

Each of the 65 questions is worth 1 or 2 marks. Ten General Aptitude questions account for 15. Engineering Mathematics written for AG takes 13 of the 85 subject marks, and the six agricultural engineering sections share the remaining 72. IIT Madras does not publish how those 72 are divided.

Questions come in three forms. MCQs have exactly one right option. MSQs can have more than one, and only the complete correct set earns marks. NATs ask for a number typed into a box.

Only MCQs carry a penalty: lose 1/3 of a mark for a wrong 1-mark answer, 2/3 for a wrong 2-mark answer.

Recent GATE exams gave candidates an on-screen scientific calculator and kept physical ones out; the GATE 2027 information brochure will confirm this year's rules. AG is full of short sums, so get used to the virtual one early.

Think of the paper as three tracks resting on shared foundations, and lay the foundations first.

Engineering Mathematics opens the plan and never stops; its statistics also turn up inside hydrology problems.

For the water track, fluid mechanics comes before anything else. Pipe flow, weirs and open channels sit underneath irrigation conveyance, drainage, wells and pumps. Hydrology and soil mechanics follow, and only then erosion, watershed management, irrigation and drainage.

On the machinery track, IC engine thermodynamics has to precede tractors, since transmission and drawbar calculations assume you can already find brake power. Gears, belts and chains from machine design pair well with farm implements.

The processing track rests on heat and mass transfer plus psychrometry. Drying, evaporation, pasteurisation and freezing all lean on them.

Surveying and storage are short and descriptive. Slot them into tired evenings. Aptitude starts in week one, half an hour a few days a week.

Built for four or five focused hours a day. Less time means longer blocks in the same sequence.

Weeks	Focus	Finish the block with
1	Linear algebra, calculus, vector calculus	Standard question types timed
2	Fluid Mechanics; differential equations	Pipe flow, weir and open channel numericals
3	Hydrology; probability and statistics	Unit hydrograph and runoff questions
4	Soil Mechanics; numerical methods	Consolidation, compaction and seepage questions
5	Soil and water erosion, watershed management, surveying	Soil loss and contour bund questions
6	Soil-water-plant relationship and irrigation methods	Irrigation efficiency and scheduling numericals
7	Drainage, groundwater hydrology, wells and pumps	Well discharge and pump power questions
8	Sources of power; IC engines	Engine power and fuel consumption questions
9	Tractors and power tillers; traction	Gear ratio, drawbar power and hitch questions
10	Machine design elements and farm machinery	Field capacity and cost analysis questions
11	Engineering properties, drying, evaporation, psychrometry	Drying rate and chart-reading questions
12	Size reduction, material handling, storage; heat and mass transfer, food preservation	A timed mixed test
13	Full-length mocks (3) and weak-topic repair	Your error log, sorted by section
14	Mocks (3), formula sheets, light revision	A calm last week

Water subjects come first because they form the largest block and each one feeds the next, and from week 3 you should reserve one session a week for whatever you studied a month earlier.

With two or three hours on weekdays, stretch the timetable to roughly 24 to 28 weeks.

Use your coursework. If this semester has tractor systems or drainage design, study those GATE topics while the lectures run.

Give weekdays to one subject and weekends to mixed past-paper questions from all three tracks, since switching between a hydrograph and a thresher is exactly what the real paper demands.

Engineering Mathematics

Complex variables are absent from the AG list, so spend the time on what is listed: eigenvalues, partial derivatives and Euler's theorem, Green's, Stokes and Gauss theorems, ODEs with Laplace transforms, distributions and regression, and the trapezoidal and Simpson's rules. Two or three minutes per question is the target.

Farm Machinery

Know how each implement works, from ploughs to seed drills, sprayers and combines. The numbers revolve around performance: theoretical and effective field capacity, field efficiency, seed and fertilizer rates, and the fixed and variable costs of owning a machine. Machine design adds speed ratios and power transmitted by belts, chains and gears.

Farm Power

Treat the engine as applied thermodynamics: air-standard cycles, indicated and brake power, mechanical and thermal efficiency, specific fuel consumption and heat balance. Tractor problems need gear trains and the differential, traction and drawbar power, weight transfer and stability, and three-point hitch geometry.

Soil and Water Conservation Engineering

No AG section lists more subjects. Fluid and soil mechanics give classic numericals; watch gauge versus absolute pressure and the units in Darcy's law. Hydrology wants rainfall averaging by Thiessen polygons, runoff estimation, unit hydrograph derivation and routing. For erosion, practise soil loss estimation and the sizing of bunds, terraces and spillways.

Irrigation and Drainage Engineering

Crop water requirement, evapotranspiration and scheduling are calculation work. Add design and efficiency of surface, sprinkler and drip systems, drainage coefficient and drain spacing, leaching requirement, and steady flow to wells in confined and unconfined aquifers. Pump curves and selection send you back to fluid mechanics.

Agricultural Process Engineering

Start with engineering properties, then drying: moisture on wet and dry basis, constant and falling rate periods, and reading the psychrometric chart. Rittinger's, Kick's and Bond's laws, screen effectiveness and conveyor capacity are reliable short numericals.

Dairy and Food Engineering

Conduction through slabs and cylinders, heat exchanger analysis and material and energy balances form the core. Then microbial death kinetics with D-value, z-value and process time, milk pasteurisation and sterilisation, freezing and refrigeration, water activity and sorption isotherms.

General Aptitude

Fifteen marks in about twenty minutes. Timed sets keep it sharp.

Earlier official papers show you how AG actually words its questions. Recent AG papers and keys are in the official GATE 2026 archive, maintained by IIT Guwahati.

As each block of the timetable ends, pull that subject's questions from several years and solve them together. In the final month, switch to complete papers under a three-hour limit.

Mark against the official key and note why each miss happened: concept gap, wrong formula, a hectare and square-metre mix-up, a misread question. Redo it a week later.

Plan six to eight full mocks across the last five weeks, written at the time of day your paper is scheduled.

A sequence that suits AG:

1. Aptitude, about twenty minutes.
2. One-line conceptual questions on implements, power sources, storage structures and processing equipment.
3. Numericals you can set up immediately: hydrographs, irrigation depth, engine power, drying.
4. Long multi-step problems, such as a full drain-spacing or heat exchanger calculation, in the time left.

Wrong MCQs cost marks, so guess only once two options are gone. MSQs and NATs are penalty-free; enter every answer you have worked out. Read the unit in each NAT carefully, because the answer box will not tell you if it expected hectares and you typed square metres.

One standard text per subject is enough.

Subject	Widely used texts
Engineering Mathematics	Erwin Kreyszig, Advanced Engineering Mathematics; B. S. Grewal, Higher Engineering Mathematics
Agricultural engineering overview	A. M. Michael and T. P. Ojha, Principles of Agricultural Engineering; Jagdishwar Sahay, Elements of Agricultural Engineering
Machine Design	V. B. Bhandari, Design of Machine Elements
Farm Power and Tractors	Liljedahl, Turnquist, Smith and Hoki, Tractors and Their Power Units; V. Ganesan, Internal Combustion Engines
Fluid Mechanics	R. K. Bansal, A Textbook of Fluid Mechanics and Hydraulic Machines
Soil Mechanics	B. C. Punmia, Soil Mechanics and Foundations
Hydrology	K. Subramanya, Engineering Hydrology
Surveying	B. C. Punmia, Surveying
Soil and Water Conservation	Schwab, Frevert, Edminster and Barnes, Soil and Water Conservation Engineering; Ghanshyam Das, Hydrology and Soil Conservation Engineering
Irrigation and Drainage	A. M. Michael, Irrigation: Theory and Practice
Groundwater	H. M. Raghunath, Ground Water; D. K. Todd, Groundwater Hydrology
Process Engineering	K. M. Sahay and K. K. Singh, Unit Operations of Agricultural Processing; A. Chakraverty, Post Harvest Technology of Cereals, Pulses and Oilseeds
Dairy and Food Engineering	R. Paul Singh and Dennis R. Heldman, Introduction to Food Engineering
Heat and Mass Transfer	Incropera and DeWitt, Fundamentals of Heat and Mass Transfer

Free NPTEL courses by IIT and IISc faculty cover many of these subjects and pair well with the books.

Fluid mechanics, soil mechanics, hydrology and surveying in this list are also core Civil Engineering material. That overlap is why CE is the second paper GATE allows with AG; the GATE CE preparation guide covers those subjects at civil-engineering depth.

Students often prepare only the track they enjoyed in college, so the machinery person skips food engineering and the water person skips tractors, yet all seven sections are examined.

Farm machinery gets treated as theory. Its field capacity, efficiency and cost questions need as much practice as a hydrograph.

Drying problems go wrong when wet-basis and dry-basis moisture are mixed. Convert first, every time.

Irrigation and hydrology answers suffer from unit slips between hectares, cubic metres and millimetres of water depth.

Engineering Mathematics left to January is 13 marks thrown away. Random MSQ guesses lose too, since one wrong tick voids the answer.

About four weeks out, stop opening new topics.

Two or three full mocks a week is plenty, provided each gets an equal stretch of analysis afterwards and you clear your mistakes notebook question by question.

Write a one-page sheet per section. Hydrology, irrigation, engines and tractors, drying and thermal processing benefit most, because their formulas are easy to half-learn, such as Thiem's well equation, drawbar power, the wet-to-dry basis conversion, F-value and D-value relations.

Do a timed aptitude set every day. In the last week, fix your sleep to match your session.

A valid AG score opens M.Tech, MS by research and PhD applications in farm machinery and power, soil and water engineering, and processing and food engineering. IIT M.Tech offers run through COAP, while NITs, IIITs and many other institutes use CCMT. IISc and several IITs hold their own MS and PhD rounds.

Some public sector organisations recruit using GATE scores and list the papers they accept in their own notifications, which you should read before applying.

Your GATE 2027 score is valid for three years from the date the result is announced. That gives you room to work for a year or two and still apply with it.

Weighing a different paper? Browse all 30 GATE papers or the other GATE preparation guides.