Dear Aspirant

The most important thing in the questions of HC Verma is thinking part. You first have to learn the fundamentals and the concepts involved in the chapter, for example you need to understand coulomb's law, etc for solving the questions of electro part, etc.

Sometimes you might need to use one or more source for the complete understanding of the concept before solving the questions.

Moreover, you might also need to give question a great amount of time sometimes as some questions are harder than the others. Do not lose patience and if struck somewhere just try to think the problem and use the hint provided. Do not search for the solution, atleast not immediately.

Hope this helps. Thank you.