Is taking Biochemistry, Organic II,and Modern physics together a risky and tiring mix?
I can postpone biochem and take another average course instead of it
Depends on you. Some people are energized by challenge, and some are not. How have you done with these types of classes in the past?
If you are intending on applying to Med schools, then this schedule could negatively impact your ALL IMPORTANT GPA.
I would recommend against taking 3 heavy duty science classes at the same time.