Most likely, these cards would have been read optically, though there seem to be some pre-punched holes in the "instructor" field. Those holes might not be actual data (i.e. a code for the instructor's name) but just to indicate which side of the card was being scanned, since it seems to be a double-sided card.
IBM produced an optical-reader "test scoring machine" in 1939, long before the computer era. See http://www-03.ibm.com/ibm/history/exhibits/specialprod1/specialprod1_9.html and the following page.
If the reader converted the optical data to punched holes, there is no problem with the volume of data, because in "column binary" mode each one of the 80x12=960 hole positions on a card can represent a single bit of data.
We used to use similar optical-input cards for project time recording, at a company I worked for in the 1970s. The marking was done using special pencils with "lead" that felt slightly greasy, made very dark black marks, and was not erasable (which would obviously be a useful feature to avoid cheating on tests!)