Slightly off-topic, but I interviewed at one of the two companies above, plus Bridgewater, and never felt so stupid in my entire life. Real geniuses in some interviews, people who know what they are talking about and have zero need for selling courses or videos. On the other hand, if they _did_ need to sell something, I doubt they would be able to, as charisma was sorely lacking.
As all I had was charisma, alas, I failed.