Those not accomplishing this will not only be behind, they will have great difficulty catching up. Because sophomore level biology courses tend to require general chemistry and junior level biology courses tend to require organic chemistry as prerequisites. Those not accomplishing this will be behind, but they may be able to catch up. Calculus and one English course should be completed during the first year. This will allow completion of the General Physics sequence during the second year.
Biochemistry is required by a few schools and is encouraged by all.
Thus, you should plan to take Biochemistry I and II during the third year. The two years of biology and chemistry and the two courses in English are minimum requirements. You begin to write your own letter of evaluation the first day of class. However, thousands of Southwestern University graduates have been accepted into these schools.