CBSE Class 12 Computer Science Syllabus 2025-26 | Unit Wise Topics & Exam Pattern

CBSE Class 12 Computer Science Syllabus 2025–26 (Code 083) – Unit-wise Topics, Exam Pattern & Marks Distribution

Computer Science is one of the most popular subjects among CBSE Class 12 students, especially for those planning careers in engineering, data science, software development, and IT. The CBSE Class 12 Computer Science syllabus 2025–26 (Code 083) focuses on Python programming, computer networks, and database management systems.

This article explains the complete syllabus, marks distribution, unit-wise topics, and practical exam structure in simple language.

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CBSE Class 12 Computer Science Exam Overview (2026)

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Unit-Wise Marks Distribution (Theory)

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Unit I: Computational Thinking & Programming – 2 (40 Marks)

This unit carries the highest weightage and is fully based on advanced Python programming.

1. Python Programming (Advanced)

Revision of basics:

• Variables

• Conditional statements

• Loops

• Lists, strings, dictionaries

User-defined functions:

• Parameters & return values

• Local and global variables

Recursion:

• Factorial

• Fibonacci series

• Sum of list

• Simple recursive logic

Exception handling:

• try, except, finally

• Common errors

• Writing safe programs

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2. File Handling in Python

Students learn how to store and manage data permanently.

File types:

• Text files

• Binary files

• CSV files

File modes:

• r, r+, w, w+, a, a+

Important functions:

• read(), readline(), readlines()

• write(), writelines()

• seek(), tell()

Operations:

• Insert data

• Search records

• Update records

• Delete records

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3. Data Structure – Stack

• Concept of stack (LIFO – Last In First Out)

• Push and pop operations

• Implementation using Python lists

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Unit II: Computer Networks (10 Marks)

This unit explains how the internet and networks work.

Topics Covered:

• Evolution of networking (ARPANET, Internet)

• Data communication components

• Types of networks: LAN, MAN, WAN, PAN

• Network topologies: Bus, Star, Ring, Mesh

• Transmission media:

  • Twisted pair

  • Coaxial cable

  • Optical fibre

  • Wireless (radio, microwave, satellite)

• Network devices:

  • NIC

  • Repeater

  • Hub

  • Switch

  • Router

  • Gateway

  • Modem

• IP addressing:

  • IPv4 & IPv6 (basic)

  • URL

  • Domain name

  • DNS

• Internet services:

  • Email

  • Web

  • FTP

  • VoIP

  • Instant messaging

• Cyber safety:

  • Malware

  • Phishing

  • Identity theft

  • Cyberbullying

  • Strong passwords

  • Safe browsing

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Unit III: Database Management (20 Marks)

This unit teaches how to store and manage data using DBMS and SQL.

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1. Database Concepts

• Need for DBMS

• Advantages over file system

• Relational model:

  • Relation

  • Tuple

  • Attribute

  • Domain

  • Degree

  • Cardinality

• Keys:

  • Primary key

  • Candidate key

  • Alternate key

  • Foreign key

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2. SQL (Structured Query Language)

Data types:

• CHAR

• VARCHAR

• INT

• FLOAT

• DATE

DDL commands:

• CREATE TABLE

• ALTER TABLE

• DROP TABLE

DML commands:

• INSERT

• UPDATE

• DELETE

SELECT queries:

• WHERE clause

• Relational & logical operators

• BETWEEN, IN, LIKE

• ORDER BY

• DISTINCT

• Aggregate functions (COUNT, SUM, AVG, MAX, MIN)

• GROUP BY

• HAVING

• Simple JOINs

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3. Python–SQL Connectivity

• Connecting Python with database

• Executing SQL queries using Python

• Fetching records

• Inserting, updating, deleting data using Python scripts

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Practical Exam Structure (30 Marks)

The practical assessment usually includes:

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Why Computer Science is Important for Class 12 Students?

• Builds strong programming foundation

• Helps in engineering & computer science entrance exams

• Useful for careers in:

  • Software development

  • Data science

  • Artificial intelligence

  • Cyber security

  • Web development

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Best Preparation Tips for CBSE Class 12 Computer Science

• Practice Python programs daily

• Revise SQL queries regularly

• Focus more on Unit I (40 marks)

• Prepare practical programs line by line

• Use NCERT book properly

• Practice previous year question papers

Click Here to Know More about CBSE Class 12 Physics Syllabus 2025-26 | Units, Chapters, Marks & Practical Details: https://dekhocampus.com/news/cbse-class-12-physics-syllabus-2025-26