I took his Chemistry 12 class. It was a very good chemistry class. If you want to do well and you are willing to put in the work, you will receive a good grade. He films each lesson and posts it online so if you miss a class or want to rewatch it, it's there. If you do all the homework (there is a lot) and understand it, you will probably get nearly 100% on the tests/quizzes. The final is optional, although I don't think anybody takes it. So, once you're done with a unit, you're done.