for an ethics homework: 'A treatment concerning the human understanding' (David Hume)
for a history exam: 'The rise and fall of the Third Reich' (William L. Shirer)
for German classes: 'The Reader' (Bernhard Schlink)

.. well, if I had time, I'd read 'Fabian' by Erich Kästner..... but I haven't got much and this book is too good to read it in a hurry....