AP Classes Advice

Hi! I am going to be a Sophomore next year taking 3 AP Classes. They are: AP U.S. History, AP Biology and AP Economics.
I was just wondering if there are any advice on those classes which includes study tips, and/or what to expect. Especially AP Economics, just because I am not familiar with it.

Thanks!

For AP US History, be prepared to know chronological order well and be able to read primary sources and analyze them well and relate them to events. AP Biology was really easy, it’s really based on experiments. I took it as a sophomore too. I don’t know about Econ. Don’t worry too much, I took 3 APs my Sophomore year too. I took AP European History, AP Biology and APCS A. I am a Junior now and I am taking AP English Language and Composition, AP US History, AP Physics C: Mechanics, and AP Physics C: Electromagnetism. Next year I am taking AP French Language and Culture, AP English Literature and Composition, AP US Government and Politics, AP Macroeconomics, AP Microeconomics, AP Chemistry, Multi-variable Calculus, Non-Ordinary Differential Equations, Statics and Introduction to Dynamics.

Thank you!! Btw for your senior year, isn’t that like 9 classes?

some are only a semester classes ^