Welcome.

I think you will find that underachievement is, sadly, not that unusual. In your case, it seems to me that there are a couple of related, but different questions:

1. How do you work with the school to best educate your child?
2. What is best for your child at this time?

The answer to #2 may not involve #1 at all, or may require going entirely outside of the system.

...pronounced like the long vowel and first letter of the alphabet...