We were in your position last year with DS's 118 / 112.
Full support from H/T & 2/1 rating. He got very high level 5 SATs.
Went through the ordeal of selection appeal.... and were unsuccessful in spite of mitigating health problems.
Our DS is at local comp (now Y7) and it was evident within first few weeks that he is working way beyound their top level class.
I would recommend going for appeal - and if it fails... there's always 12+... Roll on February 09 for our 12+ test, then the wait for results, then [hopefully] the wait for allocations and if necessary... another round of appeals.
Good luck with your choice.
Nicky & Kids