CBSE Code 083 · Free · Interactive

Class 12 Computer Science (CBSE 083)

“Functions, files, SQL and networks — learned by doing, not memorising”

The complete, board-exam-ready Class 12 Computer Science course, built as a hands-on learning experience. Write and run real Python (functions, exception handling, file handling, stacks) in the browser; practise SQL; explore computer networks with clear visuals — plus bilingual notes, projects and chapter tests. Free forever, aligned to CBSE Subject Code 083.

13 Chapters
3 Modules
Live Simulators
70+30 Exam pattern
Start learning →

🧪 Simulators

Convert number systems and flip logic gates live — don't just read the truth table, build it.

🐍 Real Python

Run Python in the browser, no install — see variables and loops execute step by step.

🇮🇳 Bilingual

Explanations in English and Hindi, tuned to the CBSE 083 syllabus.

📝 Exam-ready

CBSE theory, chapter tests and projects mapped to the 70+30 marks pattern.

🐍

Unit 1 · Computational Thinking & Programming – 2

Go beyond the basics: functions, exception handling, file handling and the stack data structure.

37 marks

Python Refresher

🔄
Review of Python Basics
Start

A fast recap of Class 11 Python — tokens, data types, control flow, strings, lists, tuples and dictionaries — with live code.

Functions & Errors

🧩
Functions
Start

Modularity with user-defined functions — parameters (positional/default/keyword), return values, and variable scope. Run it live.
⚠️
Exception Handling
Start

try / except / else / finally, and handling the common built-in exceptions — make programs that don't crash.

File Handling

📂
File Handling
Start

Text, binary (pickle) and CSV files — open/read/write, the with statement, seek/tell, and record operations.

Data Structures

📚
Data Structures: Stacks
Start

The LIFO stack — push, pop, overflow/underflow — implemented with a Python list, with a live stack visualizer.
🌐

Unit 2 · Computer Networks

How computers talk to each other — media, topologies, devices, protocols and the web.

10 marks

Networking

📡
Evolution of Networking
Start

Why networks exist, ARPANET to the Internet, and circuit vs packet switching.
🕸️
Network Media & Topologies
Start

Guided and unguided media, the topologies (bus/star/ring/mesh/tree), and PAN/LAN/MAN/WAN.
🔌
Network Devices & Protocols
Start

NIC, hub, switch, router, gateway, modem — and TCP/IP, HTTP(S), FTP, SMTP/POP3, IPv4 vs IPv6.
🌍
Web Services & Security
Start

WWW, URL, DNS, web hosting, static vs dynamic sites, and security threats & measures.
🗃️

Unit 3 · Database Management

Model data, query it with SQL, and connect it to Python.

23 marks

Databases

🗂️
Database Concepts
Start

Why databases beat flat files; the relational model — relation, tuple, attribute, degree, cardinality; keys.
🔍
SQL: DDL, DML & Queries
Start

Data types, CREATE/ALTER/DROP, constraints, INSERT/UPDATE/DELETE and the SELECT query with WHERE, ORDER BY, LIKE.
📊
SQL Functions, Grouping & Joins
Start

Aggregate functions, GROUP BY / HAVING, and joins (Cartesian, equi-join, natural join).
🔗
Python ↔ SQL Connectivity
Start

Connect Python to MySQL with mysql.connector — connect, cursor, execute, fetchone/fetchall, and commit.