Hi, hopefully your class is going to go through practice/preparation, but since I'm self-studying for the test (am native speaker), I came across these few websites that might prove helpful. Btw, the Ap chinese course started by Hanbridge Mandarin seems good. Good luck on it!!

I recommend it to everyone learning Chinese! I found this Chinese language school on a Google search cause I live in Australian and I need to learn Chinese online. I was very impressed by the teaching method and the virtual classroom, and of course, the experienced and professional teachers! I started with Hanbridge Mandarin half a year ago, which turned out to be perfect, now I'm able to chat with my Chinese friends easily.

It's good to learn Chinese. In general, you can learn Chinese yourself from the online resource and learn Chinese with a teacher, and the native teacher is best. According to your requirements, you need 1. Mastering the tones 2. Remembering the characters It is a bit difficult but keep working if you choose study yourself, so I suggest you find an Mandarin learning shool to study. You can try Hanbridge Mandarin, it provides both Chinese online teaching and learn Chinese in Shenzhen, and recommended by most students. Give it a look!