bellybreathing - have you had your son tested on the WISC? Since he is now 6, he can. This might be a better option than trying to put together a portfolio. My understanding is that they want both achievement and IQ to be at the 99.9% or higher. While a few get in with portfolio and achievement scores, it is rare. I am not confident that many do when IQ scores are below cutoff and attached in same document.
With that said - many people have better luck getting their kids to do videos than worksheets. I think 2.5 yo doing math is awesome, but probably should be a more recent video - maybe something that shows his fast progression in math.
