Heh there

Electrostatics is a very important chapter. In it for kvpy you can study

1. Calculation of electric field and potential of different bodies.

2. They may ask you to find electric field and potential at a point due to an unsymmetrical body so do it.

3. Capacitance which includes dielectrics and different cases of finding capacitance.

4. Dipole is very important.

5. Gauss law and coulomb's law is very important.

Good luck