GATE CSE 2026 — High-Weightage Topics and 3-Month Study Plan

GATE (Graduate Aptitude Test in Engineering) CSE is the gateway to M.Tech at IITs and NITs and to PSU jobs at DRDO, BARC, ISRO, and others. A score of 60+ marks typically gives AIR under 500. GATE 2026 will be held in February 2026.

Subject Weightage (Based on Past 5 Years)

| Subject | Average Marks | |---|---| | Algorithms & Data Structures | 12–15 | | Computer Networks | 8–10 | | Operating Systems | 7–9 | | Database Management | 6–8 | | Theory of Computation | 7–9 | | Digital Logic | 5–7 | | Computer Organisation & Architecture | 5–7 | | Compiler Design | 4–6 | | Software Engineering | 2–4 | | Engineering Maths & General Aptitude | 15 (fixed) |

High-Priority Topics (Master These First)

Algorithms & Data Structures (12–15 marks)

Time and Space complexity analysis. Sorting algorithms (Quick, Merge, Heap). Graph algorithms: BFS, DFS, Dijkstra, Bellman-Ford, Prim, Kruskal. Dynamic Programming. Trees, Heaps, Hashing. This is the single most important subject — do not skip any topic.

Operating Systems (7–9 marks)

Process scheduling (FCFS, SJF, Round Robin, Priority). Memory management (Paging, Segmentation, Virtual Memory, Page Replacement). Deadlocks (detection, avoidance, Banker's Algorithm). File systems. Synchronisation (Semaphores, Monitors).

Computer Networks (8–10 marks)

OSI model and TCP/IP model — know all layers. Routing algorithms (Distance Vector, Link State). Congestion control and flow control. IP addressing, subnetting, CIDR. Application layer protocols: HTTP, FTP, DNS, SMTP.

Theory of Computation (7–9 marks)

DFA, NFA, and conversion. Regular expressions and grammars. Context-free grammars and PDAs. Turing machines. Decidability and undecidability. Pumping lemma.

3-Month Study Plan

Month 1: Core Subjects

Algorithms + Data Structures (weeks 1–2)
Operating Systems (week 3)
Computer Networks (week 4)
Engineering Maths daily (30 min): Linear Algebra, Probability, Calculus

Month 2: Remaining Subjects

DBMS: SQL, Normalization (1NF–BCNF), Relational Algebra, Transactions, Concurrency
TOC: Automata, Grammars, Turing Machines
Digital Logic: Boolean Algebra, K-Maps, Combinational and Sequential Circuits
Computer Organisation: Memory hierarchy, Instruction formats, Pipelining

Month 3: Integration and Mock Tests

Compiler Design: Parsing (LL, LR), Lexical Analysis, Code Generation
Software Engineering: SDLC models, Testing, Software metrics
General Aptitude: Verbal + Numerical (easy 15 marks — don't ignore)
Full mock tests every weekend: analyse performance by subject

Important Resources

Standard textbooks: CLRS (Algorithms), Tanenbaum (Networks, OS), Ullman (TOC)
Previous year questions: GATE PYQs are the single best practice resource
Practice: Solve 10+ previous year questions per topic before moving on