CBSE 2026-27

Computer Science Notes

These Class 12 Computer Science notes are prepared strictly according to the CBSE 2026-27 syllabus. The notes cover all important chapters including Python Revision Tour, Working with Functions, File Handling, Exception Handling, Data Structure, Computer Network, MySQL Database and Interface Python with MySQL . Each chapter is explained in a simple, exam-oriented manner with examples, definitions, and key points to help students score better in board exams. These notes are useful for revision, self-study, and last-minute preparation.

Class 12 CS Class 12 IP Class 11 CS Class 11 IP

Unit 1 : Chapter 1

🐍 Python Revision Tour I

Revise Python basics, variables, data types, operators and input/output with quick board-focused examples. Perfect for last-minute revision.

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Unit 1 : Chapter 2

🐍 Python Revision Tour II

Master strings, lists, tuples, dictionaries and sorting techniques with exam-oriented questions and revision notes.

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Unit 1 : Chapter 3

⚙️ Working with Python Function

Learn functions, scope, LEGB rule, arguments and modules with easy examples frequently asked in CBSE board exams.

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Unit 1 : Chapter 4

⚡ Exception Handling

Master try-except-finally, custom exceptions and error handling with practical programs for board exams and practical viva.

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Unit 1 : Chapter 5

🗂️ File Handling in Python (Text File)

Understand text file operations, read(), write(), append(), file modes and important CBSE practical programs.

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Unit 1 : Chapter 5

🔐 File Handling in Python (Binary & CSV file)

Learn binary files, CSV handling, pickling and serialization with practical coding examples for Class 12 Computer Science.

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Unit 1 : Chapter 6

📦 Data Structures (Stack)

Understand Stack, Push, Pop and LIFO with Python implementation, flowcharts and important board questions.

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Unit 2 : Chapter 7

🌐 Computer Networks-I

Master the fundamentals of Computer Networks. Covers network types (LAN, MAN, WAN), topologies (Star, Bus, Tree), transmission media (guided/unguided, Fibre Optic), and switching techniques (Packet vs. Circuit). Includes complete guides to MAC/IP addressing, IPv4 vs. IPv6, DNS, and essential board exam tips.

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Unit 2 : Chapter 8

🖧 Computer Networks-II

Master networking devices, protocols, IP addressing, switching and routing with CBSE exam-focused explanations.

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Unit 3 : Chapter 9

🛢️ Relational Databases

Master relational databases and DBMS concepts in this syllabus-aligned chapter. Learn essential database terminology like relation, tuple, domain, degree, and cardinality. Understand keys (Primary, Candidate, Alternate, Foreign) and start writing Data Definition Language (DDL) SQL commands like CREATE, ALTER, and DROP in MySQL to structure and manage database schemas efficiently for board exams.

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Unit 3 : Chapter 10