- Previously, the correct answer, the next button
He solved the problem, you can see whether the correct answer / wrong answer. Previously, press the Next button to check your answer going beyond to other issues.
Press the answer button on the app exits after checking the answer.

- Statistics courses
After loosening the problem, you can see the expected success rate.
This function is to some extent aware that their skills can determine in advance whether or not a pass / fail when I saw the test.
Problem solving pressing problems, you can initialize reset.

- Problem solving time
When you turn off the phone screen it is the applications that solve problems are out automatically.
You can set the app running time.
Time is always, every 10 minutes, is composed of, not executed, every hour, every 30 minutes.

- Problem solving initialization
This is a function to initialize the accumulated problems.
This is a function to initialize the user to solve all problems.