Cases like this make good connections and they economize on memory. Do some group study. Group study can reveal errors and gaps in knowledge. In addition to class discussions, you can study with friends or get into discussion groups at the Academic Skills Center. If you feel shy, remember that every error you make in the group is an error you won' t make on an exam.
Concentration makes study more pleasant and vastly improves the results.
Maybe you need a more comfortable study place. Or maybe some other activity has a higher priority. Stic k to both sides of the agreement. Use your curiosity. The best learning is motivated by curiosity.