You can use this app for free no matter where you buy it and we are here with you for any problems you encounter.

This app is for learning and following up on the material in the book, which is a learning tool. You can follow the question solutions of your book, solve the questions through the application, collect and solve the errors and errors that accumulate in your error box, follow the results and measure what stage you are at.

This app allows you to create your membership information, gently scrape the white, rectangular label on the back of the Tonguç book, write the code that starts with DK' in the book activation field of the application, and use it.