Well, I don't have any personal experience with stats, so I can't really say much there. I think most people find it to be easy, though (for an AP math class lol), so you may want to take that. Definitely don't take Calc if you have any reservations about it (especially if it makes you feel sick!). I kind of wish I hadn't taken it tbh; I normally don't mind math very much and actually like it pretty well because I do well in it, but bad teachers kill it for me, and my teacher isn't the best teacher (he's a cool guy though). I'd definitely ask around and see which math classes you're considering have good teachers and which don't, if that's an important factor to you.
As for bio, I wouldn't say it was hard. I had my bio teacher for honors the year before, so I was already familiar with him and his teaching style. Some of the labs are pretty neat to do, and we got to dissect a turtle and a shark at the end of the year, so that was cool as well. Other than that, it's basically just a general biology class that goes much more in-depth about certain topics. Since you did well in your regular biology class, you'll probably do fine in AP. Just be aware that animals aren't covered a whole lot until the very end (for some reason a lot of people at my school expect it to be mainly animals, so they don't like the other stuff). A lot of it is cells before you move on to plants and then finally on to animals, but I really enjoy biology, so I liked all of it (except for the more vigorous study of plants, but it was still manageable).
Honestly, the only issue with bio is that it's a good amount of content that you have to get through for the exam, but luckily some of it's review. It's not super hands on when you compare it to AP Chem, but I think we wound up doing close to ten or so labs, so you won't be sitting in your seat listening to lectures all the time.
I hope that was helpful! Let me know if you want to know anything else.
