The School Library Association of New Zealand Aotearoa (SLANZA) has a very handy wiki. It contains all sorts of reading lists along with recommended search engines and tools.
It has a whole raft of lists for different genres, themes and reading levels, and covers both primary and secondary schools.
So, the next time you get a secondary school student asking for a recommendation for a book that meets the Wide Reading criteria for, say prejudice against women, then try checking out this wiki for suggestions.
However, you still need to get them to confirm their choice with English teacher - as some schools have different requirements from others.