I'm seeing a lot of interview prep questions now have tricks, in that, if you know the trick, the problem dissolves down to being trivial to solve. This is interfering with me not being able to prepare/feel good about interviewing as I feel I'll just `know` the questions' answers or I won't. It doesn't feel good.

Do you have any advice? I am a software engineer, been one for over a decade and this is making me lose motivation to the point that I can't study!