kakteed
You want an honest answer?
Watch historical movies, especially when you start learning about the wars. Saving Private Ryan, Black Hawk Down, Schindler's List, The Piano Man, We Were Soliders, that one David Craig movie about Holocaust escapees in the Russian forest, even Inglourious Basterds.
Pay attention to those movies and then look up inaccuracies. I swear to god our APUSH movie club was the best thing I was ever a part of ever. Oh, and I got a 5 on the test.
i actually would advise against this. OP is taking US history. almost all of these movies are about WWII which (relatively) didn't have all that much to do with america. also, especiallly if OP is not used to taking notes (they said so in a prev post), it may be hard to keep straight the convincing made up movie stuff and the factual material. (also, inglorious basterds is pretty much 100% made up. good movie though)
my advice is to take
good notes - write down important,
relevant information (i.e. no need to copy down the lecture word for word). things that your instructor emphasizes, the core of the points they're explaining, and absolutely
anything they write on the board. listen carefully and
actively - make sure you are mentally present at least 80% of the time, the more the better. sometimes it helps if you create a shorthand for yourself and use abbreviations you'll understand. it may look a little messier, but you'll be able to put down thoughts and ideas faster.
the further you get into the class, the easier it will be to determine what points your instructor thinks are important, and you'll get a feel of what might be on the test. if you're lucky enough to get a study guide before a test, make sure to read it over/fill it out/make mnemonics etc. etc., whatever you do,
do not ignore it!
most importantly, try not to stress. high school(?) history is not the end of the world. your best is the best you can do.
source: i'm a history major + history buff, and am pretty good at school!