Ditto to
Animal Farm, ( Orwell ), and Lord of the Flies, ( Golding ).
And
"In Memorium", Alfred Lord Tennyson,
also:
"Far From the Madding Crowd", Thomas Hardy, neither of which I would have got round to reading otherwise, or not for a long time anyway, and
"To Kill a Mockingbird", Harper Lee
Apart from those there isn't a single book I am grateful/beholden to school for being exposed to. Almost all the other books listed above I read off my own bat.