[jstx1]

These companies (at least the couple of companies from that group that I've interacted with) are very upfront about the interview process and provide you with enough materials to prepare.

The cost of a leetcode subscription is negligible.

I would practice more problems and try to emulate an interview setting as much as possible - set yourself a fixed time to solve the problem, walk over your solution, think about it out loud if you get stuck etc. I don't think that going over basic DS&A is enough on its own.