You would need either the teacher manual OR the videos, because they are what show actually how to teach it (both show basically the same thing, but the videos you can see, and the manual goes into a little bit more of the why behind it sometimes…but you could do fine with either one. The workbook is just practice…it doesn’t contain any actual instruction. If you were going to just get the workbook I say just get any cheap generic math workbook and it would work just about as well…because it’s the instruction that really sets this apart. The practice is fairly ho-hum and some of it wouldn’t even make much sense without the instruction. The test booklet is just really extra workbook pages and is fairly unnecessary.