Physical therapy, Occupational Therapy
Big job growth ahead
Ditto to the therapy fields, they will not be replaced by robots or assistants for a while - they pay well and the years of training are shorter.
But for pre-med if he is not “getting” the math, more books and self-study are not gonna help without a tutor, maybe even both a math tutor and a test tutor. Then if he still is lagging, maybe further reflection will be needed.
Some people are just poor at taking tests. On the practice tests, the time limit needs to be as rigorous or more so than the real exam.