I've recently watched two excellent documentaries on youtube -
The Big School Lottery - following a few kids sitting the 11+ (or not) for the grammars in Birmingham; and
Too Poor for School - about a handful of select boys from poor families trying to get a 100% scholarship to Harrow.
Both fascinating documentaries, although the first one (about Birmingham) had mostly lovely kids and parents whereas some of the parents in the Harrow documentary were a bit off-putting and one of the kids SCARY smart. My daughter is the same age and whereas he shows off he Shakespeare collection, my daughter could only proudly present her slime-making and selfie-making skills 
Anyway... if anyone has seen the above documentaries or can recommend any others please share