DS has until recently been having extra literacy help, he's very happy at school and we're lucky enough not to have any concerns with how he's getting on. Now,I know I shouldn't be getting competitive but humour me on this one.....
The class splits into groups for classwork. He's in "Circles" alongside at least one other boy I know finds his work challenging. DS has told me of 2 other boys in "Hexagons" who I know are very advanced readers.
Could it be the more sides your shape the more advanced your group perchance? Waddyareckon?