That multiple choice test scares me. I am rusty, forgot a lot of theorems, and am used to working on long proofs for everything (slow!)... but landing into remedial math would be a huge blow to my pride

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But you are presumably way more than 10 weeks out of secondary school, unlike most people who take that test. Obviously, someone who's been out of school for a while should have to study, but IMO, someone who just finished four years of math several weeks ago shouldn't have to study to pass (not get an A on) the placement test.