i have done a couple of tests for interviews in the past - and they where often very specific to the role as interpreted by the employeer
I also have set a few , and again these were very specific to the role and tested general knowledge some basic things and then more advanced pivot table manipulation and charting
I have also coached someone for a role , and again we discussed what the role consisted of .......
That could be quite a wide range of questions - powerquery, Pivot table , or simple lookups etc
Also depends on the version of excel the company is using - (not a real problem in the past) but now with 365 , lots of functions that are easy to manipulate data , which on say 2016 is quite complex formula
can you give more information about the job role - sometimes the job description has some details on what is needed
When is the interview
Do you know how to do things like pivot tables - use Powerquery
index/match