Modern Mode :
There willbe two number show on the screen and you have to calculate the sum of them.
If the sum given by the app is correct, tap the green button, if its wrong, tab the red.
Each time you pass, you will be added 1 point and so on.
If you fail, you have to take it again.
Classic Mode:
You will try to solve as many calculations as you can in 90 secs