Attended the first CodeSignal round and waiting for the next round results. It might be a lengthy process as it took 3 months for the codesignal assessment to arrive. Good Luck
Interview questions [1]
Question 1
It had 15 questions with 6 questions asked with regards to one csv, 1 SQL question, rest were based on 4 csv data. I'd say start with the 4 csv and try using sheets as its very simple analysis questions. Mostly joins, aggregatins