In which grade to people normally take different AP classes? When did you?

For example:
AP Lang & Comp
AP Lit & Comp
AP US History
AP World History
AP Chem
Others…

In my school, the way it worked was sophomores (only about 5 total did every year, I did that with bio) could choose to take either AP Bio or APUSH. Junior year, most people start taking APs, generally taking lang jr. and lit sr., world jr. and US soph. or sr., and bio then chem or physics.

Here’s what my kids generally do:

9th Comp Sci AP
10th World History AP
11th English Lang AP, Chem AP, American History AP, CAL BC AP, Physics 1 and 2 (taught as one class in our school)
12th English Lit AP, Physics C, Music Theory or AP Psychology, AP German or AP Chinese, Am Gov/ Economics

I’ll just do the ones you listed. Here’s how it is at my school:
AP Lang & Comp 10th
AP Lit & Comp 11th
AP US History 11th
AP World History 10th
AP Chem 10th, 11th, 12th

AP Lang & Comp - 11th/12th
AP Lit & Comp - 11th/12th
AP US History - 10th
AP World History - 9th/11th/12th
AP Chem - 11th/12th