<p>Pull up the thread about when classes are offered – there are links to both the current catalogue, which is available online, as well as the zot scheduler. Using the scheduler will show you when there are time conflicts for the classes you’re thinking about. 12 units is the minimum for a full time student, and most classes are 4 units. As far as over enrollment, not a bad idea, but unless your an honors student, there may be a cap (perhaps 18) for the number of units you’ll be allowed to register for without permission.</p>