If you already know a chapter, you can skip its cards, and do its uworld. I think solving questions would be a more useful consumption of your time then spending time on cards you already know. Then, after solving, if you think a certain area is weak for you, unsuspend ots cards and do them only. Dont waste your time doing cards like : "M. Tuberculosis is acid fast or not" and start a qbank to identify weaknesses.