The subscription is annual. Steps to enter the app: 1. Click install. 2. Register with your email, grade and job. 3. Check your email and look for the welcome message. 4. Click on the link to activate the app. 5. Exit and return to the app icon. 6. Login with your email and password. Reports by WhatsApp at the number 5549398404 IMPORTANT: S.D.N. It is alien to the content of this application, which is a study method that you must complement with others that allow you to memorize the agenda that corresponds to you; downloading and running it does not guarantee that you will pass the exams.