Most people (especially if they didn't win the birth lottery by being born in CA, USA) go to schools and colleges for YEARS and YEARS to come even a few steps towards what you can get at Google and FAANGS by working for a month or two to prepare for the interview.
Take a step back and consider just how damn pampered we are in this business when doing exercies for a few weeks before interview for a 250.000$+ job is too much for you.