Anecdotally I think it raised my scores by maybe 100 points. Not coaching so much as just doing practice tests to learn that, especially for the reading, the questions were actually pretty dumb. Lots of them are asking for the most basic insights. This is surprisingly non obvious or at least was not to me at the time. Many questions were filled with "traps" of answers that felt more insightful and more broadly relevant; but less relevant to the specific passages being questioned on.