I had similar experiences being sent up a few grades for my reading classes, compounded by also being sent to the special ed teacher a couple of times a week for help with my dyslexia--talk about a) conflicting messages and b) how to be made to feel like an utter freak. But I'm glad I had both experiences in the end, because I did need both the mental stimulation and the help.

Anyway good for you for thinking about these things in advance. As another September baby, I was always one of the youngest in my grade, but I think in many ways that just inspires you to work harder/take more pride in what you've accomplished. I'm sure Mina will swim along just fine in the higher level.