Hello student,

There are many publishers who publish the previous years jee main and jee advanced questions along with solutions chapter wise. You can either buy the online or a book store near you but in those books you will not be getting the questions of 2020 as JEE was conducted recently. I suggest you to wait for sometime and buy books published by good publications like arihant.The previous years question paper make your concepts strong and prepare you for the exam better. Happy preparation!