I hope it's okay if I kind of piggy-back off this post. I am a '28 appointee, so like OP's son, I have plenty of time to decide my major. Right now, though, I am interested in double majoring in physics and biology. I am interested in both subjects and after graduation I am interested in attending either medical school or test-pilot flight training. My understanding is that I need to pursue bio/chem for medical school and I need to pursue math/physics/engineering for test pilot training. My current end goal is to be an astronaut (which I know is extremely difficult but I want to at least keep open a pathway there, whether it be med school or test piloting). I have 5s in AP Physics, Bio, and AB Calc, and I'm self-studying Physics 2 and more Calc...but I don't know if any of that will help me validate courses. Also I doubt physics and bio overlap a lot. So, is it feasible to double major in physics and biology? If not, how do people generally decide their major when they're interested in two different career paths?