The core curriculum is very flexible and students can take all kinds of classes to satisfy requirements....almost always they can find something they are interested in to fulfill a requirement. He made sure to start taking classes in potential majors right from the start....his advisor said that is the best way to discover if you like the major or not. For this reason, he was urged to distribute his gen ed classes over the four years, leaving room for classes of specific interest to him right from the beginning.
The usual class load is 4 classes/quarter, and my son started taking things he liked on day 1. He really liked quarters because he could finish up something he did not love (physical science!) without prolonging his agony. He also liked quarters because the urge to procrastinate never kicked in.