grade 9 was probably the funnest year for me in high school, we used to have assemblies like every month, maybe even more, and they were always so hilarious! i had a really fun class too! grade 11 was another fun year too, alot of good memories, most of them completely random, like one of my friends who asked the supply teacher if he was a jedi cause he looked like hayden christensen, but skinnier
prom and prom party were really fun too, i thought prom was going to be crap, but i got a date, he asked me like two weeks before prom, so that was a good thing! prom party i got a little bit drunk, understatement, and threw up, alot, buts thats cause i didn't eat anything that day, so i could fit into my prom dress. high school was fun, for the most part, you'll probably have to deal with "those" people who think they're better than everyone else, when they definately aren't, and its quite a change from high school, but its fun and it goes buy quick! its hard to believe i won't be going back next year! (going to university)
some of my biggest tips would be:
shower, no joke, there was a group of people in my school and they all gathered in a hallway, and everyone would try to avoid it cause of the smell, that and they liked to throw paper balls at each other (i'm not saying this to be mean either, i'm not gonna lie, i made fun of them too, and i was one of the nicer people at high school)
also, don't procratinate too much, i was bad for doing this, i'd no papers the night before. sometimes i would stress myself out so much knowing all the projects i had to do, that i'd make myself sick
thats all i can think of, have fun next year, and good luck!