I just got back my second midterm, I am in the lowest 4% of the class on that one test. About 40% on the first midterm. The corresponding scores were 62% and 29%. Fortunately, we have three midterms and drop the lowest score. Even with the dropped score I feel like I will get a C in the class, B- at best. I spent around 5-6 hours the few days before the second test on practice problems, but still choked. I'm in the calculus based series, so if I did withdraw I would take the non-calc series next year. Is it a really bad idea to withdraw from a pre-req in the 7th week of the quarter?