¤  It is difficult to schedule courses in an organized sequence, although Math 125 and Chemistry 68 are an obvious beginning                  because they are prerequisites for almost everything else.  In addition, students need to juggle the relative level of difficulty                  found in both the biology classes themselves and their prerequisites.  For example, most students consider Biology 6 to be                  harder than Biology 7.  If you have finished Chemistry 68, then Chemistry 101 is not that hard.  Therefore, consider pairing                  Biology 6 with Chemistry 101, and Biology 7 with Chemistry 102.  It helps to carefully plan your schedule.