When to take Biochemistry?

I can either take Biochemistry with Physics II in the spring semester of my junior year (next semester), or wait until the fall semester of senior year and take it without any other prerequisite. The thing is I know Biochemistry is very important for the MCAT, which I'm planning to take in January of my senior year. Should I finish it early to study more efficiently for the MCAT over the summer before senior year, or is it better to wait until the fall semester of senior year and take it... When to take Biochemistry?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Source Type: forums