Prepare for the Computer Science and Information Technology paper (code CS) using the revised GATE 2027 syllabus. Combine subject notes, explained practice and official previous-year questions, then use full-length mocks to rehearse a three-hour paper.
This guide covers GATE CS/CSE, not every engineering paper. IIT Madras has published revised 2027 syllabuses. AISEA’s GATE mocks contain past-year and authored material with the mix shown per paper; they are not official 2027 papers or a guarantee of complete coverage of the revised syllabus.
| # | Section | Questions | Time |
|---|---|---|---|
| 01 | General Aptitude (15 marks) | 10 | — |
| 02 | Engineering Mathematics (13 marks) | — | — |
| 03 | CS Subjects (72 marks) | — | — |
GATE 2027 CS: 65 questions (10 General Aptitude + 55 subject), 100 marks, three hours. General Aptitude carries 15 marks; engineering mathematics 13 marks; the remaining CS subjects 72 marks. The 13 is a marks allocation, not a fixed question count. MCQs deduct 1/3 or 2/3 mark for an incorrect one- or two-mark answer; MSQ and NAT have no negative marking, and MSQ has no partial marking.
The official syllabus covers engineering mathematics, digital logic, computer organisation, programming and data structures, algorithms, theory of computation, compiler design, operating systems, databases and networks. Use the linked PDF as your full checklist. AISEA topic notes and exercises cover selected aptitude and CS areas; study any remaining chapters separately.
Use the organiser’s question-paper and answer-key archive for official PYQs. On AISEA, each mock lists its question count, duration, marks and PYQ/authored mix. After a mock, review incorrect answers by topic and revisit the relevant concept before another attempt. A reconstructed practice paper is different from the original official paper.
Chips with arrow icons link directly to interactive AISEA practice modules. Unlinked chips represent broader official syllabus areas covered in external or future curriculum updates.
Original AISEA examples for concept practice. These are not official exam questions, previous-year papers or a full mock test.
What is the worst-case time complexity of binary search on a sorted array of n values?
O(log n)
Each unsuccessful comparison discards roughly half the remaining search interval. The number of halvings grows logarithmically.
A page size is 4 KiB. How many bits are needed for the byte offset within a page?
12 bits
4 KiB = 4096 bytes = 2^12 bytes, so an offset from 0 to 4095 requires 12 bits.
For relations R(A,B) and S(B,C), what columns result from a natural join when B is their only shared attribute?
A, B and C.
The join matches rows on equal B values and includes one copy of the shared B column.
Attempt a full GATE CS/CSE practice paper. Each mock shows its PYQ and authored-question mix.
Browse mocksUse the linked topic exercises now for focused preparation.
Start section practiceAttempt the available 65-question, 100-mark, three-hour practice papers.
Open practice Topic exerciseRevise verbal, quantitative and analytical aptitude.
Open practice Topic exerciseReview arrays, trees, stacks, queues and graphs.
Open practice Topic exercisePractise process, memory and synchronisation concepts.
Open practice Topic exerciseStudy database keys, transactions and query concepts.
Open practiceUse IIT Madras’s CS syllabus PDF below. It is explicitly revised for 2027. This page organises the main subject areas and links to selected notes and practice; the PDF remains the complete official reference.
The published pattern has 65 questions, 100 marks and three hours. Wrong MCQs lose one-third or two-thirds of a mark for one- or two-mark questions respectively. MSQ and NAT questions have no negative marking; MSQs have no partial marking.
The official GATE 2027 downloads page links year-wise question papers and answer keys for 2021–2026 and a bulk archive. Select CS and the appropriate session. AISEA’s mock catalog separately identifies its retained PYQ and authored mix.
Treat them as full-length practice based on their published composition, not as a complete 2027 syllabus course. Compare your preparation with the revised official PDF, especially chapters without a dedicated AISEA topic. DA has a separate guide and no full DA mock catalog currently.
Tata Consultancy Services
Infosys Limited
Wipro Technologies
Accenture
Amazon
HCL Technologies
Guide reviewed 2026-10-13. Follow the provider’s current notification and your test invitation for applicable rules.