Seems too difficult for elementary schoolers – Math Train Brain Review

I had some concerns about this app. It is meant for elementary school students but some of the equations are too difficult for elementary schoolers. There are multiple higher than 12. This would not be a concern if there was a way to adjust the level of difficulty or the multiples you are able to work with. Also, it would be beneficial if there was a way to keep track of the problems you got wrong and having the option of practicing these problems.
Review by Ms_Bookworm15 on Math Train Brain.