I am also looking at grade skipping my DS6 (currently year 1). He has been seeing a tutor for English and maths, as his teacher is only giving him maths extension. The assessments the tutor gave my son show he is two years ahead for English (year 3), and at least that for maths (50% mastery of year 4). He is excelling in both subjects with nearly 100% on all tests.

I would like to read more about your experiences of a two year grade skip. One thing I thought about with my son, is that a one year skip will provide a bit more learning wise, while keeping him at the top of the class. Also, his high school I plan to send him consolidates the three final years into two- giving another grade skip. He is very mature and has no 2e issues.