Hii Aaditya,

Coming to your question the best book for preparing class 11 maths is first of all NCERT you should first do this as it is very important for your school exams point of view ,if you want more questions to practice than I would suggest you to go for kC Sinha it's different book for different topics like for algebra there is one for trigo, co-ordinate etc and SK goyalif you are preparing for any competitive exam also alongwith your school exam

At last go for NCERT first and for practice more question you can go for anyone book stated above 

Hope this help you

Hello student,

First of all, start from basic book like NCERT. NCERT is the major base of any subject. Then you can solve RD SHARMA for mathematics.Practice as much as you can. For competition level you can also solve S.L loney.  Solve previous year's question papers and sample papers.Be motivated and consistent always.

Cheers!