The AP exam is going to be on May 12th, and in preparation for that, I took the free practice exam my school offered on April 22. Fortunately, by the end of the testing period, I was able to know what I got on the mutiple choice portion: 66%(I got 44 questions out of 72), as well as the FRQ, which I did terrible on. IMO, the practice test was hard for me and I really need to start grinding, but the problem is that I honestly have no idea about where to start from. I really want to know about some great ways to aquire most of the material in Human Geography during a short period. Thank you if you gave some advice, in advance! 
Get a review book. I doubt you will find a lot of material online since it’s not such a common or useful class unlike calc or sciences.
Hi! I would definetly recommend getting a prep book. What one you get depends on you and how much time you have. If you’re very busy, try REA Crash Course, however if you have enough spare time, I would recommend buying (and annotating) the Princeton Review. Best of luck to you!
@maxim2001, while Calc and the Sciences are important, they aren’t the only important classes to take.
@history1000 I agree, however they are by far the most popular and have the most concise themes, that are easily researchable on the internet, while human geography has themes that are more broad and harder to formulate into specifics and it is in general less popular class, so there will be less info about it on the internet.
@maxim2001 If that was what you were saying, then I will agree.
I’m taking the human geography exam this year, too!
Anyway, in regard to your question, I ordered Barron’s a few days ago to study with for the next couple of weeks leading up to the 12th. As most people have said, a review book would be quite helpful. Barron’s hasn’t come yet, so I can’t personally recommend it specifically, but from what I’ve heard, it’s very thorough. If you’re gonna buy a book, order it or go out and get it ASAP—you want as much time to study as possible, especially considering your low score on the practice exam. Best of luck to you!