I am using Huawei (Mate 9, Mate 10 and P10)

Step 1: Goto "Phone Manager" in the app drawer 

Step 2: In the "Phone Manager" swipe right 

Now tap on the "Auto launch" 

Step 3: In the Auto Launch tap on the "Secondary launch management" at the top

Step 4: In there find "Skooly" in the list of apps and slide the toggle to enable notifications

Step 6: Now you will be able to get notifications from "Skooly" app

Battery Settings:

There are two sections of settings to look at in fixing this;

Step 7: Go to SETTINGS -> BATTERY -> LAUNCH, change "Skooly" from "automatic" to "manual"

Step 8: Go to SETTINGS -> APPS & NOTIFICATIONS -> APPS -> SETTINGS -> SPECIAL ACCESS -> BATTERY OPTIMISATION, change "Not Optimised" to "All" at the top of the screen, then set "Skooly" to "Not Optimised"