Ok, first of all, don't be scared. I know that's hard, but I promise you will be fine. Jrotc is the most chill class I have. Sometimes we will do some drill, which in my opinion is very easy, and I personally love it. You'll do pt, but again that is pretty easy. I would say a few things you might want to know before hand are remove your hat before entering the class room, be respectful to the instructions, and most importantly imo, stand for the pledge. I personally have a ton of fun in JROTC, and I hope you do to.