Hello tresiba is good in a sense that it’s one injection lasting much longer than levemir, but my concern is your son is quite young - sorry if I’m assuming, his hormones and growth spurs might require more insulin at different times of the day or night. Tresiba is again one injection, and it cannot be adjusted like levemir.
If he is spiking before meals, you need to take into consideration prebolus timing.
Even with injections, he still needs to leave class early to do it? I feel the pump is more discreet if he knows what to bolus for his meals. I remember attending DAFNE, and my nurses were blousing via their pump and we never noticed.
The entire school needs to be made aware of his condition, and look out for signs of hyper or hypo.
My lecturer had a similar reaction to when I had an issue with my essay, he kept asking why, and I was too afraid to say diabetes, knowing that he has a list of students names and details - including my diabetes, up until I explained my self, his tone changed.
Diabetes will always cause a minor inconvenience, your son just needs extra support right now to overcome it. I went through several years of therapy to come to peace with it so I’m sending hugs to your boy!