The best way really is to grind Leetcode, unfortunately, and using ChatGPT to ask questions and explain answers or topics. ChatGPT is very good at explaining well-defined things like CS topics and LC answers in my opinion. It most likely slurped the contents of this book and you can ask it questions directly so I think that's probably the way I will do it in the future.
In addition, the book doesn't seem to cover systems design which is an extremely critical part of the interview process for L4 and above.