What are the chances of my son who is a junior to get admissions

Your lists sound fine. None are done deals, but CWRU is a high probability based on what I know.

There are schools that have 7 year med programs, where the student enters both university and medical school at the same time. Here is a list:
http://www.ivyplanners.com/documents/BS-MD-IvyPlanners.pdf

Middle school should not count at all. The only thing that is concerning is that his AP test grades aren’t that high, but many schools don’t consider those in applications.

I would suggest he start working on essays as soon as possible, and try to get those reviewed by his English teacher and/or guidance counselor.

I can’t recommend any other colleges because pre-med is very general, but if your son picks a major, that can affect which schools he targets.

Good luck!