You're going into highschool, but you're going into Grade 10? I take it your school system is old-school where the grades are divided K-6 for elementary, 7-9 for middle, and 10-12 for high, instead of K-5, 6-8, and 9-12.
Either way, I have to agree with what Newsie and others have said, it'll almost pretty much be just a bigger dose of what you had in middle school, only with a lot more drama, so yeah... you'll know what to expect, but at the same time, you just have to brace yourself for more of it.