The fee for the paid application is one time. It is not monthly or annual. There is no time limit, you use it unless you delete it. You may need to delete the free app before installing the paid app. There may be conflicts because there are similar programs. If there is a problem with the download, Google play will refund the fee. To pay the fee from your line, your line must be open for shopping. Otherwise, your payment will be rejected.

The application consists of three parts. There are 150 words learning and 150 test questions in the synonyms section, 100 word learning and 100 test questions in the Contrasting section, 100 word learning and 100 test questions in the Contrasting section. The application is easy to use. The button color of the test, which is solved correctly, changes and it becomes easier for you to follow and your child knows where he is staying. The student does not get bored as there are 5 words learning and 5 test questions in each learning section.