Paranoid - Am I Just Worrying Too Much?

<p>So, I’m a bit confused because some core courses are 1.5 credits, and because my son will come in with a pile of math and some physics.
If he ends up needing only:
CS 42, engineering, all the chemistry, only the prob&stat math, and probably mostly the higher level core physics, what sort of schedule would he end up with in terms of 3 credit and 1.5 credit courses? Are there many courses that are 1.5 credits and NOT core courses?</p>