Looking for Sites for Students

I live in Europe, Germany and im looking for an app that i can use either on the side or when i have nothing to do. Im pretty much chronically online so apps that rewards streaks or something like that would be cool too. Thanks for the responses :)

submitted by /u/Ok_Avocado2629
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source https://www.reddit.com/r/beermoney/comments/1g267tm/looking_for_sites_for_students/