For JEE Main preparation, it is important to have a strong foundation in Physics, Chemistry, and Mathematics. Apart from the NCERT textbooks, there are several side books that can help you in your preparation. Here are some genuine book recommendations for each subject:

Physics:
1. Concepts of Physics by H.C. Verma - This book is highly recommended for JEE Main preparation. It covers all the fundamental concepts in a clear and concise manner, and provides a large number of solved examples and practice problems.

2. Understanding Physics Series by D.C. Pandey - This series consists of five books, covering topics like Mechanics, Electricity and Magnetism, Optics and Modern Physics, Waves and Thermodynamics, and Objective Physics. The books contain a good mix of theory, solved examples, and practice questions.

Chemistry:
1. Organic Chemistry by Morrison and Boyd - This book is considered the bible for Organic Chemistry. It provides a detailed explanation of all the concepts, along with numerous examples and practice problems. It is recommended for both JEE Main and JEE Advanced.

2. Physical Chemistry by O.P. Tandon - This book covers all the important topics in Physical Chemistry and provides a good balance between theory and practice. It includes a large number of solved examples and practice questions that will help you develop problem-solving skills.

Mathematics:
1. Mathematics for JEE Main and Advanced by R.D. Sharma - This is a comprehensive book that covers all the topics in Mathematics required for JEE Main. It provides a wide range of solved examples and practice problems, along with detailed explanations.

2. Problems in Calculus of One Variable by I.A. Maron - This book is highly recommended for calculus problems. It covers a wide range of problems with varying difficulty levels, and provides step-by-step solutions.

Remember, it is important to not just rely on side books, but also solve previous years' question papers and take mock tests to get a better understanding of the exam pattern and improve your time management skills.

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