I haven't read many of these, but ...
A Clockwork Orange isn't sci-fi.
OTOH, of course they included Clarke, and Asimov, and Heinlein. And Hitch-hiker's Guide. (Took 'em long enough).
Brave New World and 1984 are classic sci-fi novels. So is "Do Androids Dream of Electric Sheep?"
And, of course, Dune and Frankenstein had to be there.
But where the sod was The Long Earth?