Is it better to use one book like Cengage or solve many books like HC Verma and DC Pandey?

The consensus among most educators and toppers is to master one primary resource completely before moving on to others.

• Primary Resource (like Cengage): A comprehensive textbook like Cengage is designed to be your main source for theory, solved examples, and extensive practice. Finishing this one book thoroughly is more valuable than doing 20% of five different books.
• Concept Builders (like HC Verma for Physics): Books like HC Verma are exceptional for building a very strong conceptual foundation in a subject.
• Supplementary Problem Books (like DC Pandey): These are excellent for additional practice and exposure to a different style of problems once you have completed your primary textbook.

Strategy: Finish your main textbook (e.g., Cengage for Maths) first. If you have more time, supplement it with a dedicated problem-solving book or previous year question papers, not another comprehensive textbook.