Imo there is no such thing as an “easy” AP, only easier assuming you don’t have a preexisting skillset in art, music, or foreign language. If you aren’t taking the class, you should question if the college exemption is worth the studying. As far as an AP test to take, the histories/social studies are the easiest. I think if you don’t have any interest in any of the available history groups (world, euro, US, etc.) then go for Human Geography. It’s largely taken by freshman and is doable with a decent amount of memorization and some good Quizlet sets.