Hello,

To be honest there are sure shot questions probably from every chapter but i would suggest you to focus on strong areas and be in practice so that if some questions from it you would definitely solve it.

The maths chapters which would definitely come in exam are:-

1. 3-D Vectors
2. Probability
3. Statistics
4. Integration
5. Matrices and Determinants

From chemistry:-

1. Chemistry in everyday life
2. Biomolecules
3. Polymers
4. Ionic equilibrium

From Physics:-

1. Current Electricity
2. Magnetic effects of current
3. Wave optics and Ray optics
4. Mechanics