Difficult if you are only trying to memorize information, instead of applying your knowledge on how you would solve problems. The interviewers are there to help you succeed, as they would not want to hire someone they would not trust or be content with working next to. Keep that in mind, it is okay to be nervous.

The initial interview is with a fir call with a recruiter, then will be a 3 45min video interview with a 15 min break in between each session with a googler. Final step os a fit call typically with 2 managers, possibly outside of your selected site.