Color exploration

Exploring some different palette options for a project I'm currently working on. The brand is still very loosely-defined, so I have a lot of leeway to dictate the feel of the interface.

The app is for students, so I'm aiming for something that feels fun and playful, but it also needs to be low key enough that people can spend time in the app being productive without being overwhelmed by the colors.

Would love to hear anyone's thoughts if you have a favorite.