Now that I'm a month out, I would like to offer some advice from a Rookie, since many more of you who are members here are going to Schoolcar.
1. Forget EVERYTHING you know about Transit. You will be taught the Transit way. No one cares that you know the inner workings of an R32, or that you know the names of all of the stations. Study what is taught to you. Don't act like a know-it-all; you will be knocked down a few pegs.
2. Study, study, study that Signal book. You will get it your first week of Schoolcar. Read it 30 minutes a night, 5 times a week. Read it so that you can write it down VERBATIM. Your TSSs will give you quizzes up to the time of the big Signal exam, to see how you are progressing. Remember, 100% or else.
3. You know NOTHING. Ask questions. You will have A LOT of information thrown at you in a short amount of time, and it can be overwhelming. Don't be afraid to ask questions, even if it is simple, or you feel it is dumb. It's better to ask the dumb question than to look dumb when you do something wrong.
4. Read your Rulebook. Self-explanatory. When in doubt, refer to the Rulebook, especially when it comes to flagging, operations, and signals.
5. Study your notes every night. Do what you have to do to be able to retain the information. For me, it was creating a 42-page Word Document, with all of my notes. No, you can't have a copy of it. Sorry.
6. You will make mistakes. In the classroom, in the Yard posting, and out on the Road. Learn from them, and refer to rule number 3.
7. Get to know your classmates. You will live and breathe transit for a few months together, depending on the Division. Make sure you get a master list of phone numbers, and call your classmates if you're going to be late. It will save your ass.
8. Be respectful. I'm not saying be an ass-kisser, but be respectful. Say 'Hi' or 'Good morning' to people that work here, and if someone waves, wave back. Yes, some people are misanthropes; you're going to get that. If you act professional, it will probably help you. You are being watched all the time. Let your actions speak for you.
9. Practice, practice, practice. If you need more help on your skills, ask for it. The Motor Instructors will help you.
10. DON'T PANIC!! It is overwhelming at first, but you will have that 'Ah HA!' moment when you least expect it.
Anyone else who is more experienced than I am, feel free to contribute. Mods, make it a Sticky if you'd like.