Hi Tan, 

There's currently a slight technical issue with the quizzes when accessed on the mobile. We apologize about that!

There are two things you can do:

Option 1:

You can do the quiz on the computer if you have one. It should work there without any issues.

Option 2:

You can view the questions by viewing it in desktop mode from your mobile browser. To do so, click on the menu button at the top right of the browser and enable the option; Request Desktop Site.

Please give that a try and let us know how you get on.