At this last times I would suggest you to focus on the previous years question paper of JEE main but along with that you can also go for some books which are preferred for gmail for Chemistry you can go for NCERT because their best companion for you which will help you to score more in JEE main in case of Physics go with HC Verma the collection of questions is very good and even if you solve half of the problems then also you will score well in the exam for mathematics you can go for RD Sharma or NCERT miscellaneous examples andat th after that you can go for publication by Arihant and mcgraw hill books.