<p>I have the Barron's sat subject test book for biology. Only thing is, I have the third edition and I am planning on taking this test this October. I really don't want to buy another book, so will I be fine if I use this one?</p>
<p>You should be fine with that book! Study that well and also use other resources as well.
Ask your friends if you can borrow their books and check with your local library system. I know my library has plenty of SAT study books for students to borrow.
Good luck!</p>