It's been years I have done any coding tests. Most tests are project based now. I have forgot how to use C and Java. Given the nature of Javascript I wouldn't prefer it for algo tests. Thinking of picking up python as it is close to js. Whats your preferred language for coding tests?

Python because I don't have to worry about the syntax while coming up with a solution

C# 😊

I use JS for all the coding tests. Most of the online coding tests are related to Array and String. You rarely need to use other Data Structures.

C++, If you know C, no reason to not use C++.