I'm 11 years old, so I'm just going to be as mature as I can with this. Zearn is very aggravating, because it resets me everytime I get a question wrong. Also, I would like to add that it is behind in our in-person classwork. We're learning percentages and stuff and decimal multiplication while it's still on ratios. Not very good. It doesn't help me learn either, I prefer Khan Academy if I'm being honest.
TL;DR: Teachers, please stop using Zearn. It does not help students.