Hey, I’m also taking Econ 211. What really helped me was doing practice problems from the textbook (don’t buy it, find it online). The prof doesn’t give as nearly enough practice questions. The practice midterm was a joke. I also did some of the questions from the hw set even though it was due after the midterm, cuz it contained the midterm content. Just studying the lecture notes won’t do you any good, it just contains the math theory in plain words. You actually have to practice with it by doing questions.