To add - I think it also depends on what your expectations/capabilities are for the test. Did you get 800’s on every practice test, including the harder-than-actual Barron’s tests? Or it 750 in the upper range of your actual CB practice tests. The answer may be different in those two scenarios. And do you have time to prep to retake M2 in addition to Physics. I would think it’s a bit more challenging the further you get from finishing the course unless you keep up on review.