I am worried that I may know you in real life now Draylon, LOL!
A friend's daughter with dyslexia went to Kings for a whole of 6 weeks, she was placed in set 11, a class filled with kids with either SEN/behaviour issues/troubled home situations, all in one set. The lowest. She moved her to Westgate pronto.
I think Kings is great (grammar school like) in the top sets, and a bit of a challenge in the bottom sets.
On open days they are "famous" for just showing parents around the top sets.
Then again, Kings has the better Ofsted rating, Westgate is "only" good, Kings and Thornden "outstanding".
yes, I have done my research 
I think Thornden is more like Westgate, only with (even) better grades.
I know people who would give their right arm to go to any of the above schools though.