I am now taking ordinary differential equations or, math 33a. I passed Calc I and II with A’s. I took Calc III online during the pandemic and also went through a horrible breakup. I ended up cheating by having someone else do the virtual exams for me while paying $500 for exam 2 and 3 and the final. I got a C on exam 1. I’m not completely retarded, but I feel really ashamed about Calc III and being a fraud.

During class today, my professor said if you didn’t pass calcIII “you can’t pass this class”. Does anyone have any reference to anything I can look at to get the main tools needed for ordinary differential equations?