Thanks to the following people for helping out with app testings and other sorts of help, May Allah SWT bless you all with Jannah al-Firdaws:
Rida, Bubelle, Saad, Maryam, Julius, Yusuf, Abu Batatas, Zyl, Admiral Katheer, Iffat... I apologise if I've forgotten anyone, but may Allah bless everyone who has helped me with Jannah al-Firdaws. Ameen ya Rabb!
Huge thanks to Bonquisha for the help with the logo, may Allah reward you and your family with Jannah al-Firdaws and grant you 'Aafiyah, Ameen!
Also many thanks to Dennis from the tutorialsEU YouTube channel for the great tutorial on how to make a quiz app and Shala from TheWebShala YouTube channel for the great tutorials on web-development.