GATE CS PYQ Topic-Wise Analysis (2020-2025)

GATE CS PYQ Topic-Wise Analysis (2020–2025)

If you are deciding what to practise first, start here. Below is an aggregated view of GATE CS papers from 2020 through 2025: typical marks by subject, topics that keep repeating, and how difficulty usually splits. Treat ranges as ranges — sessions and years move a few marks either way.

The GATE 2026 CS paper is done — GATE 2027 is the live cycle, with the exam on 6, 7, 13, 14, 20 and 21 February 2027. Treat this as a reference and follow the GATE CS 2027 study plan. Syllabus, key dates, topic quizzes, and previous-year papers live on the GATE CS prep hub.

Pair this with the 2027 study plan and weightage write-up if you want a calendar, not only a scoreboard.

Overall Question Distribution (2020-2025)

Subject-Wise Marks Distribution

Based on analysis of GATE CS papers from 2020-2025:

Subject	Average Marks	Percentage	Frequency
Programming & Data Structures	13-15	13-15%	Every year
Algorithms	12-15	12-15%	Every year
Operating Systems	11-14	11-14%	Every year
Engineering Mathematics	10-14	10-14%	Every year
Computer Networks	9-12	9-12%	Every year
DBMS	8-12	8-12%	Every year
Digital Logic	8-11	8-11%	Every year
Computer Organization	8-11	8-11%	Every year
Theory of Computation	7-11	7-11%	Every year
Compiler Design	6-9	6-9%	Every year

Topic-Wise Detailed Analysis

1. Programming & Data Structures (13-15 marks)

Most Frequently Asked Topics:

Arrays and Strings (3-4 marks):

Array manipulation problems
String matching algorithms
Subarray/substring problems
Example (2023): Find maximum sum subarray
Difficulty: Medium

Linked Lists (2-3 marks):

Insertion/deletion operations
Reversing linked lists
Cycle detection
Example (2024): Detect loop in linked list
Difficulty: Medium

Trees (4-5 marks):

Tree traversals (inorder, preorder, postorder)
BST operations
Tree properties and theorems
Example (2022): Find LCA in BST
Difficulty: Medium-Hard

Graphs (3-4 marks):

Graph representation
BFS/DFS applications
Graph properties
Example (2021): Shortest path in unweighted graph
Difficulty: Medium-Hard

Hashing (1-2 marks):

Hash function design
Collision resolution
Example (2020): Open addressing vs chaining
Difficulty: Easy-Medium

Trend Analysis:

Increasing: Application-based problems
Stable: Basic data structure operations
Decreasing: Simple implementation questions

2. Algorithms (12-15 marks)

Most Frequently Asked Topics:

Complexity Analysis (2-3 marks):

Time/space complexity calculation
Recurrence relations
Master theorem applications
Example (2023): Solve T(n) = 2T(n/2) + n
Difficulty: Medium

Dynamic Programming (3-4 marks):

0/1 Knapsack variations
LCS, LIS problems
Matrix chain multiplication
Example (2024): Edit distance problem
Difficulty: Hard

Greedy Algorithms (2-3 marks):

Activity selection
Fractional knapsack
Minimum spanning tree
Example (2022): Huffman coding
Difficulty: Medium

Graph Algorithms (3-4 marks):

Shortest path algorithms
MST algorithms
Graph traversals
Example (2021): Dijkstra's algorithm application
Difficulty: Medium-Hard

Sorting & Searching (2-3 marks):

Comparison of sorting algorithms
Binary search variations
Example (2020): Time complexity of quicksort
Difficulty: Easy-Medium

Trend Analysis:

Increasing: DP problems with optimization
Stable: Basic graph algorithms
Decreasing: Simple sorting questions

3. Operating Systems (11-14 marks)

Most Frequently Asked Topics:

Process Scheduling (3-4 marks):

Scheduling algorithms comparison
Gantt chart problems
Average waiting time calculation
Example (2023): Round robin scheduling
Difficulty: Medium

Memory Management (3-4 marks):

Page replacement algorithms
Virtual memory concepts
Address translation
Example (2024): LRU page replacement
Difficulty: Medium-Hard

Deadlocks (2-3 marks):

Deadlock detection
Prevention/avoidance
Banker's algorithm
Example (2022): Deadlock conditions
Difficulty: Medium

Synchronization (2-3 marks):

Semaphores
Critical sections
Producer-consumer problem
Example (2021): Mutex vs semaphore
Difficulty: Medium-Hard

Trend Analysis:

Increasing: Numerical problems on scheduling
Stable: Conceptual questions
Decreasing: Simple definition questions

4. Engineering Mathematics (10-14 marks)

Most Frequently Asked Topics:

Linear Algebra (3-4 marks):

Matrix operations
Eigenvalues/eigenvectors
System of equations
Example (2023): Find eigenvalues of matrix
Difficulty: Medium

Probability (3-4 marks):

Conditional probability
Bayes' theorem
Random variables
Example (2024): Probability distribution
Difficulty: Medium

Discrete Mathematics (2-3 marks):

Combinatorics
Graph theory basics
Set theory
Example (2022): Permutations/combinations
Difficulty: Easy-Medium

Calculus (1-2 marks):

Limits and derivatives
Integration
Example (2021): Basic calculus problems
Difficulty: Easy

Trend Analysis:

Increasing: Application-based problems
Stable: Basic formulas and theorems
Decreasing: Pure calculation problems

5. Computer Networks (9-12 marks)

Most Frequently Asked Topics:

Network Layers (3-4 marks):

OSI model
TCP/IP model
Layer functions
Example (2023): Which layer handles routing?
Difficulty: Easy-Medium

TCP/UDP (2-3 marks):

TCP features
UDP characteristics
Connection establishment
Example (2024): TCP three-way handshake
Difficulty: Medium

IP Addressing (2-3 marks):

Subnetting
CIDR notation
IP classes
Example (2022): Subnet mask calculation
Difficulty: Medium

Routing (1-2 marks):

Routing algorithms
Distance vector
Link state
Example (2021): Shortest path routing
Difficulty: Medium-Hard

Trend Analysis:

Increasing: Practical networking problems
Stable: Protocol understanding
Decreasing: Memorization-based questions

Difficulty Level Analysis

Easy Questions (30-35%)

Basic definitions
Simple calculations
Direct formula applications
Strategy: Should be solved quickly (1-2 minutes)

Medium Questions (45-50%)

Concept application
Moderate calculations
Multi-step problems
Strategy: Allocate 3-4 minutes each

Hard Questions (15-20%)

Complex problem-solving
Multiple concepts combined
Tricky applications
Strategy: Attempt if time permits, or skip

Question Type Analysis

Multiple Choice Questions (MCQ)

Percentage: 60-65%
Marks: 1 or 2 marks each
Characteristics:
Single correct answer
Negative marking for wrong answers
Requires careful reading

Numerical Answer Type (NAT)

Percentage: 35-40%
Marks: 1 or 2 marks each
Characteristics:
No negative marking
Exact numerical answer
Range: -999.99 to 999.99

Year-Wise Trends (2020-2025)

2020

Focus: Fundamental concepts
Difficulty: Moderate
Notable: More theoretical questions

2021

Focus: Application-based
Difficulty: Moderate-Hard
Notable: Increased algorithm problems

2022

Focus: Problem-solving
Difficulty: Hard
Notable: Complex DP questions

2023

Focus: Balanced approach
Difficulty: Moderate
Notable: More numerical questions

2024

Focus: Practical applications
Difficulty: Moderate-Hard
Notable: Real-world problem scenarios

2025

Focus: Application-style questions continued
Difficulty: Moderate-Hard
Notable: Use the paper as one more year in your topic tally — not a crystal ball

Key Insights for the Next GATE CS Cycle

1. High-Value Topics (Worth Solid Prep)

Tree and graph algorithms
Dynamic programming
Process scheduling
Probability and linear algebra
Network protocols

2. Scoring Topics (Quick Marks)

Engineering Mathematics basics
Digital Logic simplification
Basic data structure operations
Network layer concepts
DBMS normalization

3. Time-Consuming Topics (Plan Carefully)

Complex DP problems
Graph algorithm applications
Operating system numericals
Algorithm complexity proofs

Preparation Strategy Based on PYQ

Phase 1: High-Frequency Topics

Solve all PYQ from high-frequency topics
Understand question patterns
Identify common tricks

Phase 2: Medium-Frequency Topics

Cover all topics at least once
Solve representative questions
Focus on concepts

Phase 3: Low-Frequency Topics

Basic understanding sufficient
Solve a few questions
Don't spend too much time

Common Mistakes to Avoid

Ignoring Easy Topics: Don't skip basics
Over-focusing on Hard Topics: Balance is key
Not Practicing NAT: Practice numerical answers
Time Mismanagement: Allocate time wisely
Conceptual Gaps: Ensure strong fundamentals

How to use this without wasting a month

Topic-wise first — finish 5–10 years of PYQs for one subject before mixing papers. Patterns only show up when you see the same topic across years.
Then full papers — timed 3-hour sits; track which subjects bleed time, not just which answers were wrong.
Close the loop — every wrong NAT or MSQ becomes a one-line note in your revision sheet (see GATE CS revision notes).

Solving random problem banks without tagging them to a year and topic feels productive and usually isn't. Practise on the GATE hub quizzes after you know which subjects you are still guessing on.