Its a rather tall question as "Biochem I" will vary from school to school and prof to prof within that school. Your best bet is to find out who will be teaching it and direct the question to them. If that's not an option, see if you can find a biochem text book and start from the beginning to get an idea of what will be covered.
When I took biochem I it was basics on what enzymes are, how they work (some mechanisms and enzyme kinetics), and how they work together to make pathways. Biochem II (again, for me) was more concerned with genetics. Your mileage may vary.