Are there any free materials online to help with AP Latin prep?

I am taking the AP Latin test, although I am in Latin IV (my school doesn’t offer AP). I have plenty of material for the raw reading - the text, vocab, etc. However, in looking into the test I saw that it will also cover themes, context, poetic devices, etc. Are there any resources online that might go over these sorts of things with an AP focus? Really just looking for options other than buying test prep books, although I will do that if it’s necessary. Thank you for any help!

Quizlet for vocab AND other test info is great; I’m taking AP Latin and there are plenty of sets available, although I love to make my own. Other than that, I don’t know of any free online resources. I will be buying a prep book later on.

You may have already taken the exam, and the materials I have on my post certainly aren’t free, but I got some of the resources at a very low price (some under $10).

http://talk.qa.collegeconfidential.com/world-languages/2088256-self-teaching-ap-latin.html#latest