People who are studying that much for the interview are never going to make it at those companies even if they "pass" the interview. They will be managed out in

People who are studying that much for the interview are never going to make it at those companies even if they "pass" the interview. They will be managed out in a year or so since weeks of studying to produce actual work isn't really a viable strategy. Having done 200+ interviews at one of the Big Companies you can generally see through "studied and memorized the question" from earnest attempts at solving it as well (asking them WHY they are doing something is an easy tell). If I were going out to interview again, the main thing I would brush up on is coding small example problems on a piece of paper/white board. The transition from IDE+internet -> whiteboard in a high pressure situation is not something you want to be coming in cold for. If you are a senior engineer, the problems/coding themselves shouldn't be that hard to tackle blind, but doing them on a whiteboard will throw you off if you haven't tried recently.