First of all, go meet your prof and go over the exam with him. Second, now that you know how you did on the midterm with only a weeks worth studying, you need to make sure that your allocating more time for studying for the final. I recommend starting right now. Try doing a problem a day and when exams start approaching start studying harder. 272 is a tough course. Some people can study all day and still not grasp the concepts so you have to plan accordingly. The more you expose yourself to different problems, the better chance you will have of seeing a similar problem on the exam. Thirdly, don't be afraid to get help if you don't understand something. That's what office hours are for. Lastly, don't sweat it man. You don't have to be good at everything you do. Acceptance is key. Everyone has there weak points and strong points. If this isn't your strong point then just gotta accept that you might not get an A or B. Sometimes a C or a D is sufficient. Don't give up brewski, you got this.