This Math navigation App, "Math Navi" has more than 50 questions which are all programmed to select values time by time so that you can learn the core of question by trying several times from different "angles".
You can see this app on Youtube here www.youtube.com/watch?v=6jzOHsx7gxw

Features

Game mode and Practice mode

Game mode which has two levels: Hard mode and Easy.
The questions in the two mode are same but required time and score are different.
After 3 questions, you can review the questions.

Practice mode which has five sections:

1. Calculation.
2. Equation.
3. Function.
4. Geometry
5. Calculus.

Each section has more than two levels and categories.
Every question is programmed to practice several times by changing value in the questions.
So you can grab the core of question by practicing.

1. Calculation
A. Basic:
B. Fraction:
C. Factorization:
D. Rationalization
E. Recurring Decimals

2. Equations
A. Linear Equations 1
B. Quadratic Equations 2
C. Inequalities
D. Absolute values

3. Function
A. Proportions
B. Invert Proportions
C. Linear Functions
D. Quadratic Functions

4.Geometry
A. Lengths
B. Areas
C. Angles
D. Pythagorean theorem
E. sin, cos, tan
F. Law of sines

5. Calculus
A. Basic
B. Differentiation
C. Integration