College Board says you should start to study by Spring Break, but I would argue NOW! Right now you only have to study 5 minutes a day, but if you wait till the week of you'll have to give hours! Who has hours - I do not! Here are a few tips:
AMSCO Prep Book
This is the favorite of the APUSH World, but all Prep Books are FANTASTIC! Barrons, Princeton Review, and etc. Get one and use it! Read it!
Heimler's History
He has the BEST Videos covering content, reviewing Units and AP Skills. He also has Review Packages you can purchase. Numerous students say they PASS the Exam due to HEIMLER.
This free! They have over 37 AP Courses - pick APUSH. They have flashcards, maps, and more. They also have AI Rubrics that will score submitted DBQs and LEQs.
Khan Academy
They have the BEST Review videos and articles. Check them out!
APUSH Gilder Lehram Review Site
Click
here for an AMAZING Review Site!