<p>My sarcastic answer (to the office, not you) is “Because I want to”. </p>
<p>I’ve taken more then 20 units plenty of times. My school never cared why though, just that you could handle it (by having a 3.0 the prior quarter). </p>
<p>Honestly, the only two “reasonable” answers I could muster is:
I want to, it fits my schedule, and I can handle it.*
I need to finish all this stuff before I graduate. </p>
<p>*although, I guess they might be asking why you want to. Are you trying to get ahead and graduate in three years? are these electives only offered once every 3-4 years? double major and need to take lots of classes? But in my mind, “Because I want to” is just as valid.</p>
<p>The only <em>issue</em> is he probably can’t register for all 23 units at first. He’ll have to register for 18 max. There was a problem with students who register for ridiculous numbers of classes only to drop them week 2 or so. This was a problem as it kept other students, who wanted the class, out.</p>