I am registering for my last semester of classes and am wondering if I should select a more difficult upper level science class or not. Taking this would make my semester significantly more difficult, but I get the feeling my courses have not been as difficult as most applicants'. I am a biology major at a good school with a 3.65 gpa. I've had difficult classes, for sure, but not too many in the upper 300-400 level. Should I just focus on getting As, or would adding a difficult class be worth the effort? I am interested in the class, but as I said, it could make things unnecessarily difficult. What do you think?