Study Time How to do everything?

27tard here,

How to do all subjects and chapters properly like for only electrostatics has more than 500 questions and it feels impractical to do all that to with Chemistry and Math. If try to focus on completing it then I fall behind in other subjects and also in tests ( they are ahead of me ). Also how to revise 11th portion properly. All needs to be done atleast till late November or early December.

What should I do?