<p>It's very difficult to schedule even 2 courses in the same department over summer sessions, let alone 3, because a lot of lectures are scheduled for the same time. However, UCD does have 2 summer sessions for you to work with.</p>
<p>Also, why are you planning to complete each major one at a time? It gets pretty boring taking 4 classes in the same major every quarter, though I suspect you're doing this so you can drop the latter one or two majors if necessary. The LSAT is offered in February, June, and October, and most law school applicants take it the June before senior year or the October of senior year, so you need to schedule at least 2 or 3 months of solid studying to get a high score. Any gains from getting another major would certainly be offset by even a 1-point increase in your LSAT score.</p>