If you apply for attendance exemption, it doesn't matter if you don't attend class, but basically all the teachers who have been retrained ask you to hand in your homework. If you hand in your homework, you are considered to be in normal class and handing in your homework. The branches of the basic repeat classes usually get about 90% full marks. If you don't hand in your homework, it's up to the teacher. Good teachers will give you more. Some teachers will give you 60% of your usual grades, depending on whether you can pass the final exam!