These quizzes would either ask you to memorize some basic material or to use some of the material in a math process or a basic idea about chemistry. Designing and giving yourself quizzes to help you schedule your studying will prepare you for the major tests. Chemtutor usually has a Quickquiz or some math problems available to you to help you. If you are studying with someone, teach it to each other. The teacher always learns more than the student.
Many students find studying with others from the same class is a lot of help.
If you get together in a group of three or four, you will always have someone to study with. They can read something or hear something and understand it. For others the number of useful learning methods are more limited. It is truly unfortunate that a small number of students have used the idea of a learning disorder to attempt to cover for laziness. Most of the students who have a learning disorder would dearly love to be like other students, but they have experienced disappointment after disappointment.