Advice on what to study

Lately i was grinding leetcode & learning to speak system design. Then a position opened but they wanted some next/ react - im ok at it but not so great writing it on the fly.

I'm honestly overwhelmed next comes with a bunch of bells and whistle - and other interviews have asked to write sql on the fly.

im like ok, this is too much curriculum to be fresh on all of it, I don't want to be embarrassed in interviews. Any thoughts on what to study. I thought leet code and ystem design + behavioral was standard.

i was a full stack 5 years ago.