If you already know you are taking the AP chemistry exam, it cannot hurt to purchase a test prep book.
Probably the best bet is "5 steps tp a 5" from McGraw Hill. This book is formatted to the newest curriculum and offers practice exams, explanations and online resources to help students.
These are Unit Review videos following the college board order. He also has a whole "AP chemistry Course" with various topics
On AP Classroom, I have already loaded ALL AP Daily videos. These are in addition to other resources we have covered. They have additional problems and may just explain things in a different way.