He can usually study the problem of license for free!
Since description also comes out in series of questions and answers at the time of an answer, it is easy to take in as knowledge.
There are two kinds of practice mode test mode of applications.
* as which the number of correct answers, a success failure, etc. will be displayed on a result screen if it answers on the problem of 20 questions in a test mode
Since a result can be sent to Facebook or Twitter, I will spread to a study friend!
* The acquisition in question serves as on-line.
* The problem of this application is setting a problem from the past problem.