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Re: Pre-Doc Quiz? UChicago Data Analysis and Coding
If you haven't read this already, then it'll be helpful: Econ RA Guide | A community guide for research assistants in economics.
I can't say for sure whether the Chicago pre-doc quiz will be similar, but it's most likely a data task rather than a CS coding interview. Doing HackerRank will likely not help except maybe help you brush up on your programming. Instead, it'd be more useful to do a data cleaning style task and also be prepared to run summary statistics/regressions. FYI, from previous people's experiences with data tasks, it is generally advised to comment copiously. It is unlikely that you would overcomment.