Use the links in the app to go to the purchase page.
Note: Individual purchases are tied to the app store you used. So Apple App store purchases can only be used on your Iphone/Ipad and Google Play store purchase on your Android devices.
This is means none of your personal information is needed to use any of the extra features.
Save your tests and quizzes so you can monitor your progress and retry when revising.
Use the Spider Model to help visualise example questions and model answers in tests.
Get extra questions not included in the main app.