The application for the Russian-speaking audience, which offers to answer 6 tests in English (25 questions in each test). The results of each test will show the results page, correctly or not you answered each question.
If you can answer all the questions correctly, then you know the language perfectly. If not, then you need to learn a little more.
The application is designed for high school students, although adults can also check themselves.
The first three tests are free. To access the following three, you will need to make a purchase in the app.
Good luck!