Exactly.
Covid threw lots of kids. Change of school to a more rigorous school dings many kids. This story can be told as one of resilience just as easily: Student changes to a more rigorous new school (hard) in the middle of HS (harder) just as the world gets hit with Covid (hardest), grades take a hit- and within a term are coming back up (good) and within 2 terms are strong (great).
Tbh, from this distance it is hard to imagine a student navigating all of this who didn’t struggle. Obviously, if it was severe / if it is an aggravation of pre-existing issues / etc that do not seem to have resolved then as the poster above noted, getting in touch with the appropriate offices wherever he ends up enrolling, and taking the tuition insurance plan are a good idea.