ISC Class 12 Computer Science — Guess Paper & Important Questions 2027
Last updated:
Everything for Computer Science in one place — guess paper, important questions and chapter-wise important topics for the 2027 exam, from analysis of 4 board + 3 official sample papers (2023–2026).
Guess Paper 2027
A full 23-question paper on the official pattern, built from the most-likely questions.
Open guess paper PDFImportant Questions
45 question patterns that have repeated across past papers.
See repeated questions PDFImportant Topics
Every chapter’s topics ranked by how often and how recently they were asked.
See important topicsTop 5 topics
| # | Topic | Chapter | Importance |
|---|---|---|---|
| 1 | Minterms, maxterms, canonical and cardinal forms | Boolean Algebra | ★★★★★ |
| 2 | Laws and theorems of Boolean algebra | Boolean Algebra | ★★★☆☆ |
| 3 | Complement of a Boolean expression (De Morgan's theorem) | Boolean Algebra | ★★★☆☆ |
| 4 | Principle of duality | Boolean Algebra | ★★★☆☆ |
| 5 | Address calculation (row major and column major) | Arrays | ★★★☆☆ |
ISC Class 12 Computer Science exam pattern 2027
Key facts
- Maximum marks: 70
- Duration: 3 hours
- Sections: 4 (Part I, A, B, C)
- Exam: 2027 ISC Class 12 board exam
| Section | What is asked | Marks |
|---|---|---|
| Part I | Compulsory (20 marks). Question 1: ten one-mark parts (multiple choice, assertion-reason and very short answer). Question 2: infix notation conversion [2], address calculation of an array element [2], dry-run of a given function [3] and completing missing code ?1?, ?2?, ?3? [3]. | 20 |
| A | Part II Section A - Boolean algebra and computer hardware. Three questions of 10 marks; answer any two (20 marks). | 20 |
| B | Part II Section B - Java programming. Three class-design programs of 10 marks; answer any two (20 marks). Programs must be written in Java. | 20 |
| C | Part II Section C - inheritance, data structures and complexity. Three questions of 5 marks; answer any two (10 marks). | 10 |
ISC Class 12 Computer Science chapter-wise weightage 2027
| Unit | Chapters | Marks |
|---|---|---|
| Boolean Algebra and Computer Hardware | Propositional Logic, Boolean Algebra, Computer Hardware | 25 |
| Java Programming | Objects and Classes, Primitive Values, Variables and Statements, Methods, Arrays, Strings, Recursion | 31 |
| Inheritance, Data Structures and Complexity | Inheritance, Interfaces and Polymorphism, Stacks and Queues, Linked Lists and Binary Trees, Complexity and Big O Notation | 14 |
Unit marks are approximate — the syllabus does not fix them, so they are estimated from the marks each unit carried in past papers.
Frequently asked questions
Is this the real ISC Class 12 Computer Science guess paper 2027?
No. It is a practice guess paper built by analysing which questions and topics repeat across 4 board + 3 official sample papers (2023–2026) for ISC Class 12 Computer Science. It follows the latest official exam pattern but is not an official or leaked paper.
What is the ISC Class 12 Computer Science exam pattern for 2027?
The ISC Class 12 Computer Science 2027 paper is 70 marks and 3 hours long, in 4 sections: Section Part I — Compulsory (20 marks); Section A — Part II Section A - Boolean algebra and computer hardware; Section B — Part II Section B - Java programming; Section C — Part II Section C - inheritance, data structures and complexity. Highest-weightage units: Java Programming (31 marks), Boolean Algebra and Computer Hardware (25 marks), Inheritance, Data Structures and Complexity (14 marks).
How many questions repeat in ISC Class 12 Computer Science?
We found 45 question patterns that appeared in two or more of the analysed papers (4 board + 3 official sample papers). The most-repeated ones are listed on the Important Questions page.
What are the most important topics for ISC Class 12 Computer Science 2027?
The top topics by repetition are Minterms, maxterms, canonical and cardinal forms; Laws and theorems of Boolean algebra; Complement of a Boolean expression (De Morgan's theorem). The full ranked list is on the Important Topics page.
Where can I see the ISC Class 12 Computer Science guess paper?
The full 23-question guess paper is on the Guess Paper page — free to view, with each question tagged by chapter and how often it has appeared in past papers.