So I’m a rising senior and I’m planning on studying for the SAT 2 biology m test over the summer. However, I do not really want to buy a book. So I was wondering if I could just use my AP biology cliff notes book from when I was a sophomore?
Anyway thanks for taking the time to read and hopefully answer my question. 
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Cliffnotes is really good, but I recommend getting an SAT II Biology book so you can get used the way the test asks questions and the timing. There is also some material emphasized on the subject test but not on the AP Exam that you should review. If anything, you should still get the small blue SAT II book with an official biology SAT II practice exam. maybe you could find it online somewhere.
Thank you so much! I 
I will try to do the things you suggested
You’re welcome. Personally I used the Barron’s review book and I took bio e and got 780 but I think just having AP Bio helped a lot too.
Okay thanks. Maybe I will go to the library and try to find that book.