cmulvenna:
I agree with much of what has been suggested.
6/7 year olds concentrating fully for 45 minutes is a big ask
a pattern of always having easy work is not good long term - eventually they'll come up against something tricky and most likely freak out or give up completely
not wanting to be the clever one - may not be an expressed or even fully understood pressure - but even at this early age kids are remarkably aware of who's doing well in a class and can behave very badly toward that child
What I will add is that friendships are very fluid at this age and often there can be weeks when children who otherwise were great pals don't seem to get on at all. My advice is to carry on with outside school activities and encourage your son to be kind, helpful and supportive of he classmates - as ultimatley children tend to like other nice children and avoid difficult children. Both DDs have had periods where nobody would play with them, which they found very upsetting, but they do pass (almost as fast as they started).
My advice is to look round the school playground and point out things your DS can do on his own:
Are there scooters that anyone can use - encourage him to consider doing that at recess
Is there a climbing frame?
Are there skipping ropes?
Is there a wall you can play hand ball against or bounce a ball against?
Could he join in a football game?
Is there a hopscotch grid?
Is he allowed to draw on the playground with chalks?
Is he allowed to take paper and pencil outdoors and draw?
Is he allowed to take a book outdoors and read?
Is there a quiet area in the playground - where maybe he can do a bit of gardening or watch animals?
Is there a school pet, which he could help with at recess?
Could he offer to help teachers (sharpen pencils, lay out papers, etc...) during recess?
Teach him to be confident whether he has friends to play with or not. If there is nobody about to play with (for whatever reason) then encourage him to find solutions.
HTH