I’m going to be a senior next year and wondering what kind of prep book should i get for SAT I and II? What kind of book that prepare the best reasoning test SAT? What kind of book is best prep for US History, Biology M, and Math IIC?

What are the good books to study for ACT and SAT II? For Biology E/M, Math IIC, and US History?

Which book should be the best for preparing for Math IIC SAT Subject Test? I was looking through Barron’s and it seems pretty difficult to understand, considering that I only took trig but not pre-cal. I am looking for a book that explains the concept step-by-step instead of cramming everything such as Barron’s. I just dont think that Barrons is the right book for me. I already bought the sparknotes version b/c i thought it covered the material that we only NEEDED to know. What other books are out there? Kaplan? Princeton?