Well, the computerized testing is a good thing. Frankly, I would go visit the school (if it's still in session) and sit and observe in the K, 1st,2nd and 3rd classroom. See which bunch of kids are doing stuff that would be at a similar level to what your son is ready to learn. Then request that your son spend all or part of his day in that classroom.

Is the K full day or half day?
Can you send him to a private school as a first grader, and then bring him back to public the following year?
Is there a local private school that has multiage classrooms so he can go to different grade levels for different subjects?
If school is still in session, see if they will do an IQ test now, instead of waiting until the Fall - and the computer testing. I would be very worried indeed about him spending all day in K while they 'sort him out.'
Is homeschooling a possibility?
In the meantime, I would hothouse emotional self mastery. My favorite book for this is 'Transforming the Difficult Child Workbook' by Lisa Bravo and Howard Glasser.
Good Luck, and so glad you found us!
Grinity


Coaching available, at SchoolSuccessSolutions.com