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How to Score 90+ in CBSE Class 12 Computer Science (Python & SQL)
How to score 90+ in CBSE Class 12 Computer Science. Python and SQL carry most of the marks; here's how to practise code-writing and output questions.
Computer Science is dominated by two areas: Python programming and Database/SQL.
Where the marks are
| Chapter | Avg marks per paper | Share |
|---|---|---|
| Python Revision & Functions | 24.5 | 39% |
| Database & SQL | 21.5 | 34% |
| Computer Networks | 8.8 | 14% |
| Exception & File Handling | 7.8 | 12% |
| Data Structures (Stack) | 0.8 | 1% |
Averaged across 4 CBSE Class 12 Computer Science (CS) board papers, 2023–2026. All chapters
Python
- functions, scope and parameters
- file handling: text, binary and CSV files
- data structures: stacks with lists
- exception handling
- output prediction: trace code by hand, line by line
Write code on paper as well as on a computer, since board answers are handwritten. Indentation and syntax matter.
SQL
- SELECT with WHERE, ORDER BY, GROUP BY and HAVING
- aggregate functions and joins
- DDL and DML commands
- Python–MySQL connectivity
Networks
Learn topologies, devices, protocols and network types precisely. These are quick marks.
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