I took mostly AP classes in high school, and it was surprisingly easy for me, but that was probably because I didn't take the math or sciences AP courses, only comp sci, english, and history. My schedule Junior year looked like:
-AP English Language
-AP US History
-AP Computer Science 1
-Honors/Pre-AP Sociology/AP Psychology
-Honors/Pre-AP Precalculus
-Honors/Pre-AP Physics
-Honors/Pre-AP Spanish 3
And Senior year:
-AP English Literature
-AP Government/Economics
-AP Computer Science 2
-AP Spanish 4
-Criminal Investigations (blow off elective)
Math and science has never been my strong point, and since they weren't required senior year in high school where I went, I didn't take them, which I regret now that I only just managed to pull off a C+ in Calculus I in college. I think those are the one's that make up most of the workload. Computer Science was hardly an AP class, it was an easy A even if you didn't have previous programming experience, although most colleges won't accept those AP credits, but it was a good GPA booster. English and history really weren't bad either where I went, English was all just reading and a few essays, and history was about the same. I ended up getting 12 credit hours (Government, Economics, US History, and Spanish 4), because I got a 3 on both English exams and needed a 4, which is a decent chunk of classes. One of my friends who took basically every AP class he could managed to get out of 46 credits (about 3 semesters) in college

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So, now that I've told you my entire academic history, I would recommend dropping one of those sciences and replacing it with calculus if you plan on having a chance of doing anything but studying all the time

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