CBSE Class 12 Computer Science (083) Sample Paper 2026 & Important Questions

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Download the official CBSE sample paper

These are CBSE's own 2025-26 sample paper and marking scheme (the source of truth for the 2026 exam), straight from cbseacademic.nic.in:

Official Sample Paper (PDF)Official Marking Scheme (PDF)Get it on WhatsApp

In class, Kajal Ma'am solves the full paper with you, question by question, with the marking scheme. Book a free demo.

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Exam pattern at a glance

100 marks total = 70 theory (3 hours) + 30 practical. The theory paper:

Section	Questions	Marks
Section A	Q1–21 · 1 mark each (MCQ / very short; write the answer text for MCQs)	21
Section B	Q22–28 · 7 questions · 2 marks each	14
Section C	Q29–31 · 3 questions · 3 marks each	9
Section D	Q32–35 · 4 questions · 4 marks each	16
Section E	Q36–37 · 2 questions · 5 marks each	10
Theory total		70

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Unit-wise weightage

Unit	Marks
Unit 1 — Computational Thinking & Programming-2 (Python functions, exception handling, file handling, Stack)	40
Unit 2 — Computer Networks	10
Unit 3 — Database Management (SQL & Python-SQL connectivity)	20

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Most important topics & the questions that repeat

Where the marks actually are, and the kinds of questions to expect. For the exact questions and answers, use the official paper and marking scheme above.

File handling in Python — text, binary (pickle) and CSV files

Why it matters: Sits inside the 40-mark Unit 1 and recurs as 4- and 5-mark questions.

Questions that repeat: Write user-defined functions to read / write / append / search / update records in a text, binary or CSV file; predict output; read() vs readline() vs readlines().

SQL queries and Python–MySQL connectivity

Why it matters: Core of the 20-mark Database Management unit; spread across Sections A, D and E.

Questions that repeat: SELECT with WHERE / GROUP BY / HAVING / ORDER BY; aggregate functions; joins; output prediction; fetching rows from MySQL inside Python.

Python user-defined functions, arguments and scope

Why it matters: Foundation of the 40-mark Unit 1.

Questions that repeat: Predict output; default vs positional parameters; global vs local scope; functions that return values.

Data structure — Stack (using a list)

Why it matters: A distinct high-value topic within Unit 1.

Questions that repeat: Write push() / pop() to implement a stack on a list, often while filtering records.

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Common questions

What is the CBSE Class 12 Computer Science (083) exam pattern for 2026?+

The 2026 board exam (2025-26 session) is 100 marks: 70 marks theory (3 hours) + 30 marks practical. The theory paper has 37 questions across 5 sections, A to E.

Where can I download the official CBSE Class 12 Computer Science sample paper 2026?+

CBSE publishes it on cbseacademic.nic.in. We link the official sample paper and marking scheme PDFs for the 2025-26 session directly on this page.

Which topics carry the most marks in Class 12 Computer Science?+

Unit 1 — Computational Thinking and Programming-2 (Python functions, exception handling, file handling, Stack) (40 marks). Unit 2 — Computer Networks (10 marks). Unit 3 — Database Management (SQL and Python-SQL connectivity) (20 marks).

What are the most important questions in Class 12 Computer Science?+

The recurring, high-value question types are File handling in Python — text, binary (pickle) and CSV files, SQL queries and Python–MySQL connectivity, Python user-defined functions, arguments and scope, Data structure — Stack (using a list). Download the official paper above for the exact questions with the marking scheme.

CBSE Class 12 Computer Science Sample Paper 2026 & Important Questions