The classes work like this, each Sticky is labeled under a specific job title that you would (most likely) be striving to get aboard a Starship after graduation. Under these titles will be a list of some of the classes that you will be taking in order to achieve your desired major. Also, there will be Stickies related to graduate level type classes, ie Bridge Officer Examination, Command school, and Medical school

By the way I got all my information concerning courses from:

http://games.pbem-portal.com/startrek/ussterranova/courses.htm