The problem is the school doesn't have transcript. Parents get typed up report describing the contents of various subjects were taught and how the student did on the subject, follow by couple of sentences of tests given and score. There's no grading (A+, A.....). I am not worried about showing he is very capable academically since he has very high SSAT and SAT. I worry that it reflect upon him negatively that no 7th grade teachers are willing to say something about him.
What about this: I'll write something up myself, a letter to the schools he's applying, about why I home school (more flexibility in academics, he needs time to study/travel for his EC competitions......) and his growth during this time.... etc. I am hoping this can replace the school report. I'll also send in copied of his academic reports from past, though there's no grade on it.