When you say “step up his resume”…what do you mean? It isn’t stepping it up for college. More and challenging academic courses do that.
If he wants hands on Med experience in HS, I would suggest he volunteer at the hospital or take an EMT course and volunteer with the rescue squad.
If his end goal is to become a doctor, this is not the way to do it. Being a doctor is all about doing very well in college, and that is usually because you have prepared in HS.
I suspect the Votech classes are more for people who will be health aides as a job.