It’s not great. Basically gives you a question and answer from a github page (system design primer). The answers are okay but wouldn’t pass you in an interview. Its also difficult to predict whether your partner will know what to do.
No dude, it didn't ask any such question. May be I'm doing wrong. I don't know. Upon clicking in the link, it asked me to sign up, once I signed up with my email/GitHub , it said, we are in beta, use interview cake instead. It said