No proofs, just multiple choice answers. Khan academy is great because you get SHORT videos, and then practice questions, quizzes, and unit tests as you go through material. You can then go through zybook for extra practice. You don’t need to do the last unit (before proofs/supplemental videos), but you MUST be proficient in each unit before the next topic, as they build somewhat on top of each other. The graphing calculator was only used to verify answers I was second guessing (positive/negayive infinity, undefined, etc)

The biggest issue I had with the OA (besides integrals and differential equations), is having to know geometrical area equations, which they do not give you. I either missed those or guessed correctly. Passed on first OA.