Hello student,

Jam 2020 examination which is conducted by IIT Kanpur is one of the most popular examination for the candidate who is to pass aware postgraduate course from various IIT. And it is completely depend upon your capacitive level. If you think one book is enough for you to Remember then that's all. Otherwise you should read best two books for IIT JAM. click here to know more about preparation of jam.

https://university.careers360.com/articles/how-prepare-jam-chemistry