Hey, I just studied that yesterday and honestly, I don't see them asking mechanism questions at all on the MCAT. I mean, at this point, the basic elimination/substitution mechanisms should be intuitive for you, but for Hofmann degradation I would just know that you need a base to start, you lose the carbonyl as CO2, and you form a primary amine from an amide.
Start doing some practice tests even if you know you're going to bomb it. Then you will know it's pointless to memorize mechanisms like this one.