It may have changed, but in my day you sat the 11+ or whatever and if you passed you would automatically get in to the grammar school. Think tehre was an appeals process for those who didn't. Mind you, my school was weird and went on teacher recommendation, not the 11+, and started at 14, so not all areas are the same.
There are some v good grammars in Lincs and also some very good technology colleges and the like. Which area were you thinking of?