I'm surprised people say it is not helpful. I myself find this app quite interesting to me honest. Not only is it free it helped me get straight a pluses for three tests in a row thanks Sal and company. Plus it is meant to be boring so why complain idiots.
So good in fact, that I wish I had something like this during my years at school. You young people don't know how lucky you are, to have access to something like this. Nice app you've got going here mate. I hope you can include more topics to study in the near future. Keep it up. Maybe add some simulation exercises.
I HIGHLY HIGHLY recommend this app if you want to brush up on math from any level. The math courses have really helped me understand the high school math I struggled with. One small problem I found is that moving the dots to the accurate position on a co-ordinate plane is too awkward on a touch screen.
Great idea and beautiful interface and excellent videos and question but when I start to bookmark subjects I didn't count it and now app got really slow can you make a limit for it because I lost the control and I can't use app now.
By the way, I found this very helpful. It is NOT A GAME! It's used for help in educational things and helps us understand a concept better.
Very very very helpful. Especially for people who find math hard and confusing
Bug fixes and improvements.