This is a continual ongoing debate on this site, about selective education 'the rights and wrongs of it'. However, the Sutton Trust recent survey has shown some interesting findings , regarding % of disadvantaged sixth form students gaining entry to 'selective' Universities from selective towns and non selective towns. Altrincham and Sale (Fully Selective towns 44% of disadvantaged sixth form students , went to the most sought after Universities. This is in contrast to similarly 'disadvantaged' sixth form students from Newcastle of just 4%.
This shows that grammar schools are able to push/help disadvantaged students, in to achieving higher grades and 'aspiration' than from Comprehensive/College type sixth forms.
This is a important statistic in showing that, a lot of the ground work in helping these disadvantaged students attain 'great' grades is done in the first three years of a 'selective' school.
I am going to say something that will upset a few people (surprise).
In life you are like the 'company you keep' therefore by going to a grammar/selective school , you are with the people you aspire to be with throughout your life.