I am a student and I use this app for school, and it is the worst app I have ever used. I hate it so much every time I do my work and I get a question wrong it makes me have to get two in a row in order to for my other answers to count and make progress to move on to the next level. It so stupid if I get one wrong why can't I just continue doing regular questions instead of making me have to do two in a row. And when I'm trying to get my stupid two questions right in a row if I get one wrong I have to restart and get two more questions right again. It's such a stupid app and it takes me forever to do my homework because of it, I haven't learned anything from it because of how horrible the app is. I'm sure this app would be so much better if they wouldn't make us do two questions in a row. If you are a teacher, I would not recommend this app to your students and hopefully they can update this to make it easier and actually better to use.