I go over the quiz's as soon they finish taking them, the students seem to like this. This gives them the chance to ask any questions they might have about the quiz.

Sometimes I find it somewhat of a challange to "slow down" or "speed up" the class. According to how student are keeping up. Every so offten I get classes that are all over the spectrum. How would I "slow-down" and "speed up" at the sametime?