8.1 Licensed icons used:

Exercises / Homework

Icons made by prosymbols available on Flaticon.com.

Direct download: https://www.flaticon.com/free-icon/homework_748646

Study

“Study” icon original from http://www.onlinewebfonts.com/icon is licensed by CC BY 3.0.

Icon direct download link: http://cdn.onlinewebfonts.com/svg/download_532202.png

Version used: colorized with PhotoShop by JYS in herits CC BY 3.0 license.