I have a Xiaomi phone (MIUI 6)

Step 1: Tap on "Security"

Step 2: Select "Permissions"

Step 3: Select "Autostart"

Step 4: Scroll down to find skooly and swipe right to enable it.

Step 5: Press Back

Step 6: Skooly should be visible under "Apps can autostart"

Step 7: Open your Phone Settings

Step 8: Open Apps

Step 9: Open Skooly

Step 10: Select 'Show notifications'

Step 11: Turn on 'Floating notifications and lock screen'

Step 12: Press back

Step 13: That's it.