I DON̢۪T USUALLY READ the required text. Paying attention to the lecture usually does it for me, assuming the professor isn̢۪t a moron.
As a plurality of my professors are by far not morons, it̢۪s been years since I̢۪ve even opened up the syllabus-mandated, officially approved, isn̢۪t-it-interesting-that-my
-professor-published-something book for a class.