GATE ES Preparation Guide
IIT Madras (organising institute for GATE 2027)
Your Complete Preparation Guide for GATE ES 2027 — strategy, study plan, tips & more.
Exam Overview
Mode
Online (CBT)
Frequency
Annual (February)
Next Exam Date
6, 7, 13, 14, 20 & 21 Feb 2027
EEligibility Criteria
BTech/BE/BSc/MS in relevant science or engineering streams — open to a wide eligibility list
ANumber of Attempts
No limit
Study Plan by Subject
Mathematics Foundation
Week 1-4: Foundation
Core concepts & basics
Week 5-8: Deep Practice
Advanced problems & revision
Week 9-12: Mock Tests + Revision
Full-length tests & weak-area focus
Refer to official syllabus for complete topic list
Environmental Chemistry
Week 1-4: Foundation
Core concepts & basics
Week 5-8: Deep Practice
Advanced problems & revision
Week 9-12: Mock Tests + Revision
Full-length tests & weak-area focus
Refer to official syllabus for complete topic list
Environmental Microbiology
Week 1-4: Foundation
Core concepts & basics
Week 5-8: Deep Practice
Advanced problems & revision
Week 9-12: Mock Tests + Revision
Full-length tests & weak-area focus
Refer to official syllabus for complete topic list
Water Resources & Hydraulics
Week 1-4: Foundation
Core concepts & basics
Week 5-8: Deep Practice
Advanced problems & revision
Week 9-12: Mock Tests + Revision
Full-length tests & weak-area focus
Refer to official syllabus for complete topic list
Water & Waste Water Treatment
Week 1-4: Foundation
Core concepts & basics
Week 5-8: Deep Practice
Advanced problems & revision
Week 9-12: Mock Tests + Revision
Full-length tests & weak-area focus
Refer to official syllabus for complete topic list
Air & Noise Pollution
Week 1-4: Foundation
Core concepts & basics
Week 5-8: Deep Practice
Advanced problems & revision
Week 9-12: Mock Tests + Revision
Full-length tests & weak-area focus
Refer to official syllabus for complete topic list
Solid & Hazardous Waste
Week 1-4: Foundation
Core concepts & basics
Week 5-8: Deep Practice
Advanced problems & revision
Week 9-12: Mock Tests + Revision
Full-length tests & weak-area focus
Refer to official syllabus for complete topic list
Global & Regional Environmental Issues
Week 1-4: Foundation
Core concepts & basics
Week 5-8: Deep Practice
Advanced problems & revision
Week 9-12: Mock Tests + Revision
Full-length tests & weak-area focus
Refer to official syllabus for complete topic list
Environmental Management
Week 1-4: Foundation
Core concepts & basics
Week 5-8: Deep Practice
Advanced problems & revision
Week 9-12: Mock Tests + Revision
Full-length tests & weak-area focus
Refer to official syllabus for complete topic list
Expert Preparation Tips
Environmental Chemistry and Water/Waste Water Treatment together carry the heaviest weightage — start there
Memorise water quality parameters (BOD, COD, DO, hardness) with their standard values and units — direct questions recur
Practise unit-process design numericals: sedimentation tank sizing, chlorine demand, BOD removal efficiency
Keep a running sheet of environmental laws and standards (ISO 14001, CPCB norms, international protocols) for the management section
Solve all previous GATE ES papers (2021-2026) — the paper is young and repeats frameworks
Exam Pattern at a Glance
| Section | Questions | Marks | Duration (est.) |
|---|---|---|---|
| Mathematics Foundation | 7 | 11 | 20 min |
| Environmental Chemistry | 7 | 11 | 20 min |
| Environmental Microbiology | 7 | 11 | 20 min |
| Water Resources & Hydraulics | 7 | 11 | 20 min |
| Water & Waste Water Treatment | 7 | 11 | 20 min |
| Air & Noise Pollution | 7 | 11 | 20 min |
| Solid & Hazardous Waste | 7 | 11 | 20 min |
| Global & Regional Environmental Issues | 7 | 11 | 20 min |
| Environmental Management | 7 | 11 | 20 min |
| Total | 65 | 100 | 180 min |
Important Dates
Registration Opens
2 Sep - 5 Oct 2026 (late fee until 12 Oct 2026)
Next Exam Date
6, 7, 13, 14, 20 & 21 Feb 2027
Conducted By
IIT Madras (organising institute for GATE 2027)
Frequently Asked Questions
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