Hi bertrand : as a teacher of A level, you'd think I'd know! But boys doing A level English is a dwindling thing and those that do it eitehr don't talk about what they read or don't read 
However, I cna say those who do liked White Teeth, The 100 Year Old Man Who Climbed Out of the Window and Disappeared and non fiction stuff like White Teeth. As far as set texts go , some of them liked God Of Small Things and Atonement was popular with the boys.
Boys often like non fiction and Sapiens was a hit.
I recently read This Thing of Darkness ... it's amazing and definitely would eb enjoyed by a clever boy, especially if he likes science , ethics and/or history, too.
Lots of good books about politics and Trump, too, at the moment!
The Secret History is one of my A Level class's favourite books. I found it overwrouhgt , but pretentiousteenagers seem to like it.
I shall keep thinking about this because I love the idea of a reading boy!