Ask HN: How to stay interview ready in 2020?

With numerous companies laying off due to COVID-19 situation and overall uncertainty in the job market. How do you stay interview ready and prepared? Also, there have been numerous times I am contacted by companies for interview opportunities. And every time I find myself in a position where I'm totally unprepared for it and feel overwhelmed by the number of things I need to study in a very short span of time.

How do you guys stay interview ready and well prepared for when the chance comes?