Period 8 is probably elective so dont freak about that. I know where your comming from went to private till high school, but 3 years now and im ummmmmm..... well my shiz got a little complicated xD. Although some chuffed up shiziznit happened with me.
Just get to know people, but use your judgement on who to hang with and who not to hang with based on how you see them act with others AND (really stress this and) how they act with you. Once you find some people you know you can trust and be cool with (some homies
) you will start learning everything you want and need to know quick. Just dont be the loner in the corner of the class... trust me had almost 2 years of that and it SUCKED! Also most importantly dont be fake no one respects that shiziznit.
edit: well my HS is little different almost brand new and I came in just after the year it started. 100 students per grade so it went from 200-->300-->400. Small school, but still pretty much the same.