[caw]

I read Elements of Programming Interviews rather than do LC questions online. That book has a few flavors for popular languages—-just level up on the language you know best, don’t try to learn a new one.

I spent about a month covering the book, and then grokking the systems design.

It’s not so much the knowledge as the familiarity with the interview format and expectations (ask clarifying questions, explain your reasoning). The company I ended up joining had an opportunity for a mock phone screen interview, which I took advantage of. It was roughly a LC easy but covered the format and gave me some feedback on how I conducted myself.