SDpro Math

Never heard of SDPro Math This amazing app keeps you on your game. You need recap after class or even a study tool to pass...?
SDPro Math gives you short quizzes on topics that you may struggle with.

Step

First you choice your subject

Then you choice your game mode Fun, Challenge or 2 player

Then you answer quiz (usually 35) that they give you 

Sometimes the game may be timed depending on the game mode

I picked Trigonometry and clicked One Player Challenge and this is question 3 of 10 the little 50/50 box narrows your answer down to 2 choices if you're having difficulty. The Cos of 90 degrees is 0 each answer has an explanation for why its that answer.