Your goal is to be able to answer questions that you can answer. If they ask a question and you have no idea at all, then you might not get an offer. But, if they ask a question that you definitely know, you will feel bad if you flub it.

So, practice. If you have a friend that can do a mock interview, do it. If you have time to practice leetcoding, set it at a level you can do and just practice coding under a little pressure.

You are not trying to learn more algorithms, you are trying to get better at performing what you already know.

See also Professional Performances