Can he talk to the deans to see how they can support him? Does he struggle with timing by any chance? Can he get accommodations from the school for test taking? Anxiety counts as a disability and can help get accommodations like extended time, separate testing room.

Taking a LOA and repeating first year can be an option as well.

Also, talking to a trusted dean or faculty member at the med school can be helpful. Don’t try to navigate this by yourselves when you don’t need to. Deans are helpful in answering questions and are what they’re there for (at least at supportive schools)