Many People will suggest many Books but Before suggesting books I would like to say don't confuse among many books, By this time should finalize which book You are going to follow because If you will search for books, again and again, You will end up reading the same topics again and again and missing many Topics which is Not a good strategy for toppers, If You want to score well In JEE Main Never remain to confuse later books even if you are switching to some other books them also don't need to repeat whole topics.

You can consider the following books:

Chemistry: NCERT Will be sufficient to use Previous Year IIT paper solve all of them Including subjective.

Physics: HC Verma and NCERT use DC Pandey for more Practice and solve good Problems of Irodov

Mathematics: RD Sharma, Amit M Agarwal, SL Loney for Trigonometry and Coordinate Geometry

There are a lots of books are available in the market for jee mains most important is problem solving for that you can buy arihant previous year sample question bank for jee which contains previous 10 year questions approx 

 For organic and inorganic ncert is best 

For maths arihant is appropriate

For modern physics again ncert

For objective questions go with hc verma

For physical chemistry n awasthi is best 

For problem solving in organic chemistry you can read from ms chauhan