As for his university courses during high school… usually you can only get financial aid if you are enrolled as a degree seeking student, so a student taking one or two classes probably won’t get any financial aid. Your state has put a limit on the amount it will contribute per course and you have to find something that fits within the limit or pay the difference. I don’t know of many merit awards for students who aren’t full time either, but you may find a civic group that would consider helping - American legion, Rotary, Elks - but only at the local level. Ask your high school guidance counselor if she knows of any businesses that might help.
You might also consider online courses. He may not get credit, but he’ll keep up on math.