A few additional comments:
1.) Instrument matters. If he is a vocalist, he may not have to do a lot outside of school. I’m assuming he’s an instrumentalist. Others have commented above related to that.
2.) Does he have a good private teacher? Or maybe the music teacher at his school is good? He (and you) could have a discussion with the teacher about goals and his readiness. Most of us did that. Good teachers can determine ability/readiness etc and ease his mind. Also he could add private lessons (if time allows and not done already) to increase skills and have a mentor.
Good luck.