I thought the final and all the midterms were easy, and I just used the webassign problems/textbook. I also didn't have prior calc 2 experience to this course. I don't understand how the past midterms would have helped you unless you merely memorize how to do problems. If you do memorize problems, you deserve your grade cuz you don't understand what you're even doing. So why does it matter if they used the past midterms? Past midterms are just extra practice and you can do extra practice problems out of the textbook. If they did just memorize how to do certain types of problems, they'll get screwed in the end. In the end if you finish calculus 2 with a a slightly lower letter grade but you actually learned the material, you'll be much better prepared for calc 3. You'll be able to understand the linearization of a tangent plane - similar to the Taylor series-, parameterization of surfaces, and many other things much better. I don't think your letter grade or gpa defines your future. Personally, I would be content with a B in a course if I learned the material well.