AP Chem and USH

I have spring break starting in a week and will have a month off from school.

I want to study for the AP Exams effectively during them. What would you all recommend for each?

i have friends in both those classes this year (im a junior).
im in apush class and im gonna be taking the exam as well. my teacher recommended the kaplan prep book cuz it has like 8 practice exams and has rlly thorough explanations (better to be overprepared than underprepared).

as for chem, i am not in the class but i hear the struggles fr it everyday from my peers. from what ive read in numerous forums on this website, the barron 7th edition has alot harder practice q’s than the actual test so it makes the mc alot easier but theres some material in the book (organic chemistry supposedly) that is not included on the actual exam. the other book recommended was PR but some were saying that it underprepares you and is too basic for review.

college board provides a thorough outline for all the factors included in each big idea for the test (they do that for every ap exam) so i guess you can look at that.