My senior year I took AP Biology, European History and English Language and Composition.
I learned so much from those classes and I loved them and my Bio and English teachers (Euro teacher was a cave-dwelling sadist), but I did not love the workload.
I over loaded myself and, mixed with my chronic procrastination, ended up blowing my exams.
stressed
EDIT: Notes for the exams.
BIO: Mitosis, protein synthesis, organelle functions, Kreb cycle, ATP synthesis, ecological graphs, bio chem, plant make up and functions, attributes for each branch of the animal kingdom, etc.
ENG LANG: Fallacies, argumentative essays, grammar and punctuation, underlying meanings within phrases, sentences, paragraphs, works, etc. Annotating is good in the reading.
EURO: Document-based questions, portraits, lots of (Italian) Renaissance, Age of Enlightenment, Martin Luther, Machiavelli, Protestant reformation, French revolution/Napoleon, Communist Manifesto. They don't ask much about the 20th century.