Help! I have no idea what AP class to take Junior year...

Have you taken Physics? AP 1 is usually a first course and AP C a second (following either 1 or Honors Physics in school that don’t have 1/2).

Which Comp Sci? CSP is a good intro class. CSA is more rigorous and you should have a previous programming class or some experience. Both are probably better than Stats.

AP USH, Physic C and Lang are all heavy workloads. Physics 1 and Stats, not so much.