CS is a fairly easy subject, you have very less to study and prepare. If you have been consistent through t the year, then I can guarantee 90+ for sure.
- C++ region is a good scoring area. Till pointers its very to score like OOPs, Basics of 11th std, Files, Arrays, Functions.
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- Solve the previous 5 years question papers. CBSE follows a similar pattern every year. Solving the previous 5 years papers will ensure you 90+ marks in CS 12th board exam.
- Learn all terms related to RDBMS, framing queries using SELECT, ORDER BY, GROUP BY, EQUI JOIN.
- Flowcharts are the easy and best way to understand and remember programming.