We have some very good state schools in our area and a grammar.
The kids who get into the grammar are really tutored.
I'm going to give the grammar a shot for ds1 but I doubt he'll get in as I haven't tutored from the age of 5, which seems to be the norm around here.
But how much of a difference is it actually?
Fwiw, I went to grammar and was in the bottom streams which didn't do much for my confidence at the time.