Hello student yes Rd Sharma book for mathematics is good for practice as it contain wide range of questions.

But I'll recommend you to first complete NCERT thoroughly and solve each and every question and example of NCERT it'll help you in basic concepts.

Some of the other reference book for mathematics are as mentioned below -

Plane Trigonometry by S L Loney

The Elements Of Coordinate Geometry by S L Loney

Algebra by Dr S K Goyal Arihant Publications

For more details refer to the link mentioned below - https://www.google.com/amp/s/engineering.careers360.com/articles/best-books-for-jee-main/amp

Feel free to comment if you have any doubt

Good luck

Hello Aspirant,

See RD Sharma is one of the good known books for Mathematics preparation but for JEE-Main like national level engineering entrance examination depending upon only one book would not be the wise choice so if you practice the questions from different books, so you will get to solve different type of questions. So I am enlisting down some best books for preparation of JEE-Main :-

@Mathematics

Higher Algebra-Hall and Knight

Coordinate Geometry-S.L. Loney

Differential and Integral Calculus-N. Piskunov

Calculus and Analytic Geometry-Thomas and Finney

IIT Mathematics for JEE Main & Advanced-M.L. Khanna

Course in Mathematics for IIT-JEE-Tata McGraw Hill publication

Problems Plus in IIT Mathematics-A Das Gupta

Trigonometry-S L Loney

@Physics

Concepts of Physics-H. C. Verma

Fundamentals of Physics-Halliday, Resnick and Walker

Problems in General Physics-I. E. Irodov

University Physics-Freedman and Young

Understanding JEE physics series-DC Pandey

Problem In Physics-SS Krotov

@Chemistry

Modern Approach to Chemical Calculations-RC Mukherjee

Organic Chemistry-Solomons and Fryhle

Concise Inorganic-J. D. Lee

Organic Chemistry-Morrison and Boyd

University Chemistry-Freedman and Young

Physical Chemistry-N Awasthi

Arihant's Practice Book Chemistry for JEE Main And Advanced-R.K Gupta

For complete details kindly check out the link given below :-

https://engineering.careers360.com/articles/jee-main-preparation-tips-for-january-exam

You can also check out the JEE-Main knockout package for preparation of JEE-Main 2021 from the link given below :-

https://learn.careers360.com/knockout-jee-main-april/?product=27&icn=knockout-jee-main-2021-january&ici=

I hope this information helps you.

Good Luck!!