Son is Finding School Too Easy!

Hi guys!!

My son is 6 years old (P1 in scotland).

So the problem we have is he so intelligent that his school is running out of any challenging material.

His intellect spans across the board it isn't  a select specialist subject ..his capacity for learning is phenomenal.

He does struggle socially and although he is beginning to enjoy playing with other children, he hasnt the first clue on how to initiate the play as such. He will just stand close by and watch and as a parent this breaks my heart because he wants to be involved. I have spoken several times with the school about perhaps focusing on his social skills but they seem happy to just "manage" him. Rather than encouraging him to excell!

He is now becoming very frustrated, constant meltdown but they dont occur at school it's the minute I pick him up he's just so drained that I think it all just comes flooding out. His communication and behaviours have reverted massively. He seem to be going backwards in terms of coping strategies....every single thing is a fight...his need for control at home is becoming unbearable....from what I wear, to what everyone at home does ( dad, baby sister and myself). Even if he is occupied and totally engrossed in an activity...if he hears his dad or I watching a program he will come down and demand to pick the episode even though the minute he does he will leave the room and go back to his activity. The same if he walks I  and I'm changing his sisters bottom, he will have a melt down because he hasn't gone to get the wipes or nappy (I include him when ever I can). All of these behaviours get worse after school. I have tried to have multiple conversations with him about school but he point blank refuses to engage. 

I suppose my main question is ...is there anything I can do to make the school get their finger out and provide better support and materials? any advice would be greatly appreciated because right now I feel completely useless.

Thanks