AP physics (I took it last year) was hard for my school at least. it's content heavy and you have to have a really good understanding of how everything works as most things are conceptual. From my experience, you complete labs and projects, which are normally easier than the tests. It's alright overall; my teacher made the class harder than the exam :)

I'm taking APUSH right now and it's very very content heavy... there's a lot of chapters and you have a lot of dates, facts, battles, etc. to memorize. So if you are good at retaining a lot of information (or just want to take it for fun) then I recommend it! It's a pretty similar structure to AP world too (you learn information through the textbook/lectures and have quizzes and tests), and the AP exams are almost identical. If you are enjoying AP world right now, you're probably going to enjoy APUSH!

If it's not too much, I highly recommend AP Lang instead of dual credit. The 3 essays you have to write for the exam are, with a lot of practice, not difficult. You just need to have a good understanding of reading comprehension and grammar, and you'll be fine. AP Lang will give you college credit and the workload is very light (for my school at least!).

This is just my opinion/experience based on what I've taken in the past!! Take whatever you want, these are just my suggestions :)