The MyTimeTable.de-App allows you to have your timetable, "homework book" and exam dates always with you. Just type in your timetable on the website (currently German only) or in the app. Once you have logged in your timetable will also be available offline. You can also easily add homeworks or mark them as "done". The homework, exam-dates functions and the first time using the app require an active Internet connection. The App requires a free MyTimeTable.de-Account, which can be created within the App.

Screenshots taken with iOS7 (available this fall) - appearance vary a bit on older versions Push Notifications for homeworks are currently only available in Germany.