GATE 2020 will be conducted for 25 different disciplines:
SUBJECTS 
CODES 
Aerospace Engineering 
AE 
Agricultural Engineering 
AG 
Architectural Engineering 
AR 
Biomedical Engineering 

Biotechnology 
BT 
Civil Engineering 
CE 
Chemical Engineering 
CH 
Computer Sc and Information Technology 
CS 
Chemistry 
CY 
Electronics and communication Engineering 
EC 
Electrical Engineering 
EE 
Ecology and Evolution 
EY 
Geology and Geophysics 
GG 
Instrumentation Engineering 
IN 
Mathematics 
MA 
Mechanical Engineering 
ME 
Mining Engineering 
MN 
Metallurgical Engineering 
MT 
Petroleum Engineering 
PE 
Physics 
PH 
Production and Industrial Engineering 
PI 
Textile Engineering and Fiber Engineering 
TF 
Engineering Services 
XE 
Life Sciences 
XL 
The GATE exam will be a Computer Based Test of 3 hours. The paper consists of both MCQs And NAT questions. There will be three sections. Section A is will be General Aptitude, which is compulsory for all 25 disciplines. Section B is Engineering Mathematics(or chemistry) and Section C will be the chosen subject paper.
SECTION A:
General Ability (GA):
General Aptitude (GA) is a common section in all GATE Papers. General Aptitude holds 15% weightage. The General Ability syllabus is divided into two groups, Verbal Ability and Numerical Ability.
SECTION B
CASE 1: Section B includes compulsory subject Engineering Mathematics for courses with paper codes AE, AG, BT, CE, CH, CS, EC, EE, IN, ME, MN, MT, PE, PI, TF, and XE. It holds 15% weightage. Its sub topics for the respective papers are as below:
Aerospace Engineering (AE) 
Linear Algebra, Calculus, Differential Equations 
Agricultural Engineering (AG) 
Linear Algebra, Calculus, Differential Equations, Vector Calculus, Probability, and Statistics, Numerical Methods 
Biotechnology (BT) 
Linear Algebra, Calculus, Differential Equations, Probability and Statistics, Numerical Methods 
Civil Engineering (CE) 
Linear Algebra, Calculus, Ordinary Differential Equations (ODE), Partial Differential Equations (PDE), Probability and Statistics, NumericalMethods 
Chemical Engineering (CH) 
Linear Algebra, Calculus, Differential Equations, Probability and Statistics, Numerical Methods, Complex Variables 
Computer Science and Information Technology (CS) 
Linear Algebra, Calculus, Probability, and Statistics, Discrete Mathematics 
Electronics and Communication (EC) 
Linear Algebra, Calculus, Differential Equations, Probability and Statistics, Numerical Methods, Vector Analysis, Complex Analysis 
Electrical Engineering (EE) 
Linear Algebra, Calculus, Differential Equations, Probability and Statistics, Numerical Methods, Complex Variables, Transform Theory 
Instrumentation Engineering (IN) 
Linear Algebra, Calculus, Differential Equations, Probability and Statistics, Numerical Methods, Analysis of Complex Variables 
Mechanical Engineering (ME) 
Linear Algebra, Calculus, Differential Equations, Probability and Statistics, Numerical Methods, Complex Variables 
Metallurgical Engineering (MT) 
Linear Algebra, Calculus, Differential Equations, Vector Calculus, Probability and Statistics, Numerical Methods 
Mining Engineering (MN) 
Linear Algebra, Calculus, Differential Equations, Vector Calculus, Probability and Statistics, Numerical Methods 
Petroleum Engineering (PE) 
Linear Algebra, Calculus, Differential Equations, Probability and Statistics, Numerical Methods, Complex Variables 
Production and Industrial Engineering (PI) 
Linear Algebra, Calculus, Differential Equations, Probability and Statistics, Numerical Methods, Complex Variables 
Textile Engineering and Fiber Science (TF) 
Linear Algebra, Calculus, Differential Equations, Probability and Statistics, Numerical Methods, Complex Variables 
Engineering Sciences (XE) 
Linear Algebra, Calculus, Ordinary Differential Equations (ODE), Partial Differential Equations (PDE), Probability and Statistics, Numerical Methods, Vector Calculus, Complex Variables 
Engineering Mathematics (XE A) – Compulsory section 
Fluid Mechanics (XE B) 
Material Science (XE C) 
Solid Mechanics (XE D) 
Thermodynamics (XE E) 
Polymer Science & Engineering (XE F) 
Food Technology (XE G) 
Atmospheric and Oceanic Sciences (XE H) 
CASE 2: If a candidate is applying under discipline, Life Sciences(XL), instead of Engineering Mathematics, the compulsory subject would be Chemistry. They have to choose two subjects from sections Q to U:
Chemistry (XL P)  Compulsory section 
Biochemistry (XL Q) 
Botany (XL R) 
Microbiology (XL S) 
Zoology (XL T) 
Food Technology (XL U) 
SECTION C:
Section C is subject specific section which will have questions from the specific subject chosen.