The Premium features are:
- Multiplatform sync
Allows you to sync iStudiez Pro data on any of your devices (of any platform).

- Tasks (available on Mac and Windows at the moment. Soon on other platforms.)

- Tasks for Exams
Set a list of key points for yourself you have to focus on.

- Tasks for Classes
Get ready for all the topics covered.

- Tasks for Assignments
Split a large assignment into smaller sub-tasks

- Recurring Tasks
An easy way to add plenty of similar tasks.

- and many other cool features in the future