| The exams aren't so bad; the lab reports/quizzes are really where people tend to lose the most points, I think. I would also be careful of your lab performance, as that is one portion of your grade that your TA has complete control over (it's especially bad if you're in a lab group of really good people, as a grading curve is forced from the TAs regardless of if everyone's about the same).
As a whole, the lecture classes are curved to a B. The lab classes are pretty variable, but about probably somewhere around a B as well. Best of luck, feel free to ask more questions. | 
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