From another thread:

Originally Posted by st pauli girl
By the time our DS was 7, he had been in 3 different schools.

I remember reading somewhere that changing schools is common among HG+ kids, primarily because a school that works this year may not work anymore in two or three years.

This has been our experience, with DD9 heading for her third school next year and DS13 also having been to multiple schools. I'd be very interested in hearing from others about this idea.