please help me with ap psych

ok, so my school is on block schedule. so i have 4 classes a day, each 90 minutes long, and then i switch after winter break. anyway, i had ap psych last semester and i was so lost in that class. i never got higher than a 85 on the test, and it just made me feel stupid overall. i really need to study it, yet i barely remember anything. what are some good tools I could use??