N.B. If you print the quizzes or tests, you should set scaling to "none" or set size to "actual size" or set magnification to "100%" (depending on your PDF viewer). You should probably not print the lecture presentations at all.
Also: your PDF viewer should be configured to use the fonts embedded in these PDFs. Mathematical expressions may become unreadable if font substitutions are allowed to occur. Viewing in a browser or phone tends to be particularly bad with math fonts.