The problem set is worth 5% of every homework quiz. If you do not do the problem set (as demonstrated by presenting the solution to a randomly selected problem) then you can earn a maximum of 95% on a homework quiz. Here are the expectations for problem sets.
In the lead-up to the AP Chemistry exam your teacher will give you several packets of practice problems from old AP Chemistry exams. You will be given a scoring guide so that you can correct and score your own work. It is strongly recommended that you take the time to attempt every problem without googling any answers or looking at the scoring guide. Use any other resources you care to consult including your textbook, notes, graded quizzes, or other classroom handouts. Work together with another student if you like but every student must write down their own work.
By completing the problems and the corrections you will earn a 100 for a grade worth 1/4 of a lab.