Recopy your notes again at home. Of course you should study your class notes at home;
but just (re-)reading them is too passive. Studying must be active. It is all too easy when just
reading passively to have your mind wander or even to fall asleep.
The main idea behind re-writing your "raw" class notes (besides making them more legible
and organized) is that the very act of copying them is one of the best ways of studying them!
Further study of your class notes can then be done from these "cooked" ones that are neater,
more legible, more organized, and more complete.
This may include taking your notes from class and re-writing them into the chapter outline
from the beginning of the unit.