SAT II Subject Tests- which books to refer?

Hey! i am new to this forum, so forgive me I wasn’t supposed to start a new discussion or something.
I am an international student, and I will be taking my SAT II Subject tests in October. I will be applying for the Biology major. I was thinking of takin The Physics, Maths 2 and Bio Subject tests. What do you people recommend? Also, what are the best books to refer to cover the portion. And, what is an ideal study schedule to follow? How many practice tests shoud i take before the test? Where can I get them online?
Looking forward to the answers.
thanks.

bio, barrons 4th edition, i got 800 with that book only