When I was in middle school in the 90s, I think around 7th grade (~12yo), the school district experimented with a new way of organizing the student body where they separated us into six distinct, equally sized cohorts based on some evaluation of each student's performance and capability. From what I could tell it was rougly: 1. Gifted / clearly university-bound 2. Potential college prep 3. Community college 4. Normal…
I was a trouble maker at school. In my final two years, my history teacher took a special interest in me for whatever reason. I now have a masters degree from Cambridge university. I was forced to study with the good kids (who actually tried to bully me ironically) but it worked out really well for me. I think a lot of disruptive boys can really benefit from a strong masculine teacher that forced them to see that there's a better way.
Also, there are some kids which are just going straight to jail. No idea how to deal with them.