AP World History
AP World is really not too bad. If you have some general knowledge of world history, you should be beyond fine. The only thing I would really suggest is that you try to keep the theme of "continuities and change" in the back of your head while studying. One of the free-response questions focuses on that theme, so it would be best if you actually knew it.
Quick Tip: Make sure you don't dwell on ancient civilizations, they are a very small portion of the test, and it would be better to focus on the things that actually matter, check the College Board website for more information on the different things that are important that you will need to know!
As far as preparation goes, I just used the Princeton Review AP World History book. I also used the Barron's AP World History book, but I didn't have enough time to finish it. My suggestion would be to use Barron's though. I really thought it was helpful and it gave a lot of insight into the continuities and change themes. However, the Princeton Review "blurbs" were also extremely helpful. So, if you are only planning on reading one book, read Barron's, if you are extra dedicated, read Princeton Review too.
As always, feel free to ask if you have any questions!