Dont let that stress you out. Most of what they teach you is common sense. What you want to do is learn as many of the safety tips as you can cause an accident in the first 30 can send you back for a year too, not to mention hurt you or others.
Enjoy the classes. They should be informational and can be a bit entertaining at times. And just dont sit there. If you have a question, be sure to ask. That is how you learn.