Another way to look at this is that interviews are like tests where you already know what the topics are. So a company with a 'standard interview process' is t

Another way to look at this is that interviews are like tests where you already know what the topics are. So a company with a 'standard interview process' is testing your ability to study for and do well on a test. That's a crude measure of how well you can pick up new things and apply them, within certain bounds. A large majority of these interviews are also testing for non-technical skills too - like communication, patience, humility, and thought process. Don't stress out too much about interviews, they're something like 30% technical, 30% non-technical, and 40% luck.