CBRS is a service that is provided during periods of intensity or episodes of need. There is a point in the provision of any rehabilitation treatment plan, in which the rehabilitation services being provided are no longer restorative in nature. A Member discharged from CBRS does not exclude the possibility that he or she may again
Another way to look at it is that the undergraduate course is aimed at training you how to use a tool (Probability for an example) while the graduate course is aimed at giveing you the foundation (theory) to develop your own tools.
It depends on the college and the program. In my undergrad program, the credit goal for full-time students was 16 credits per quarter. For many people, this sometimes worked out to 4 4-credit classes, particularly in the first year or so of school when they were working through their general requirements.