My D took an initial dislike to the ACT because of its pacing. However, after not getting the score she hoped for on the SAT, she did a timed practice test at home and got very encouraging results. With some prep, she did even better, putting her into the merit scholarship category for the schools where she applied. I recommend that your son do the same and if there’s potential, use the rest of the summer to prep for the September test.
U MA Amherst Honors program has become increasingly competitive. Colorado School of Mines is also increasingly difficult to obtain merit scholarships (and he would have to apply early for consideration - check deadlines!) At Case Western, his chances would be improved by applying non-restrictive EA. In the RD round, I know of excellent students that were shut out but students with lower stats who applied EA got in.
Also as mentioned earlier, there are lots of public universities in the West where he might qualify for in-state rates with his stats. If he’s interested in going farther afield, I can follow up with examples. However, it looks like there are plenty of good options for him that wouldn’t involve getting on a plane. U VT would be a great place to go to college.
Edited to add: I posted this link on one of your other threads. Lots of good ideas there. Scroll back several pages for compiled stats of students from the class of 2017, including merit outcomes.