Some of the chapters which occur in high-frequency in all the years are:

1. Semiconductors (Physics)

2. Work Power Energy (Physics)

3. Thermodynamics (Physics and Chemistry)

4. Electro-Chemistry

5. Solid State (Chemistry)

6. Conic Sections (Maths)

7. Environmental Chemistry

8. Biomolecules and Polymers (Chemistry)

All these chapter have a very high probability of coming in the exam and they are very easy to score. Once you are done with them, then you should be moving towards more advanced topics such as Rotational Motion, Calculus, Ionic Equilibrium and so on.

Moreover, you should aim to focus on a selected few chapters first as clearing the cut-off will be no big deal if you master a select few chapters only, and once you have cleared the cut-off, then no one is stopping you from going any further.