AP Classes for Sophomore Year

Hey! So, as soon as I become a sophomore this following September, I am going to be taking 2 AP’s in my schedule –– AP US History and AP Chemistry. I wanted to get ahead in this month because I really want to achieve a 5 in the AP tests since I’m a nervous test taker. Can anyone suggest any websites, books, or other resources to get ahead in AP Chem and History? Thank you!

I’ve purchased two AP prep books for my D - Princeton Review - mostly to be able to look at the format of sample tests, study suggestions, test-taking tips, etc. that can float around in her head through the year.

Studying actual material, in advance, doesn’t seem to be worthwhile.