Take all "answers" from these quizzes: Countries, US States, World Capitals, Periodic Table, 100 most Common Words.
Sort them alphabetically: the first 25 go in the 1st column.
Now remove the first letter of all "answers" and sort them alphabetically: the first 25 go in the 2nd column. Similarly you get the answers for 3rd and 4th columns.
Hope this is clear.
If you want to suggest how to write quiz instructions in a clearer way do tell, thanks.