Hey !

You can know the best books for iit jam biological sciences and preparation tips by following the given link:

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

But it is hard to find their free pdfs , you will only find their substitutes  and i don't think you should just rely upon substitutes.

You can give IIT JAM biological sciences free mock tests by following the given link:

https://university.careers360.com/articles/jam-mock-test

Best wishes!

Dear candidate,

 You can download biological sciences IIT JAM question paper for last 13 years from 2007 - 2019 in PDF format.

Link  is given below.

http://www.gate2016.info/iit-jam-papers-bl-biological-sciences/

Hope I answer your question and it's helpful.

All the best!