Which are the best books prefered for JEE mains? Is CENAGE books best for JEEmains?

I would suggest you to go through the below provided preparation tips and books as these will be helping you to crack the exam with flying colours -

1. Know the syllabus very well.
2. Read standard books only as there are many books available in the market so it is advisable to use the books which make all your concepts clear and which are easy to understand.
3. Understand the weightage of topics properly.
4. Proper Revision plan should be followed.
5. Mock Tests and Practice Tests should be done as this will help you to learn time management skills and this will also make you familiar with the exam pattern. Books which you can consider -
Physics
Concepts of Physics Vol I and II by H.C. Verma
Problems in General Physics by I.E. Irodov
Fundamentals of Physics by Halliday, Resnick & Walker
Chemistry
Numerical Chemistry by P. Bahadur
Organic Chemistry by Paula Bruice Yurkanis
Inorganic Chemistry by J.D. Lee
Organic Chemistry by Morrison & Boyd
Mathematics
Maths XI & XII by NCERT
Trigonometry by S. L. Loney
Co-ordinate Geometry by S. L. Loney
Higher Algebra by Hall & Knight
Problems in Calculus of One Variable by I.A. Maron

Note : CENGAGE would also helping you as this is a good book as every problem in this book is quite different and helps in understanding and strengthening the concepts.

Hope this helps!!!

Firstly I would suggest you to go through well with NCERT books properly to build your concept then prefer other books & CENAGE is a good book to refer other books also you can go:

Physics : Concept of Physics by H.C. Verma , Fundamentals of Physics by DC Pandey , Problems in Physics by I.E. Irodov

Chemistry : Numerical problems in Chemistry by P. Bahadur, Organic Chemistry by O.P. Tandon.

Mathematics : Mathematics by R.D. Sharma, Algebra by Hall & Knight

Good Book!