i-School Pro is a study organizer (for schools and universities). Very minimalistic but has everything you need: daily/weekly schedule, textbooks and notes (attached to classes), homework with notifications, grades, study analytic. Take a pictures or use voice recording as a note. Very simple. Very useful.
The full feature's list is:
• download and keep your electronic textbooks at hand;
• study schedule )daily/weekly);
• write or take a picture of homework or make notes;
• study analytic: grades, average grades, correlation with your your mood;
• notifications: start/end of classes and homework due date;
• share your homework on social networks;