How to select questions?

1. Web version:

You could select the questions that you would like to practice by clicking "My Classes" → "Question Source"→ "Select Chapters" on Game Map.

Or you could practice official or teacher's missions by clicking "Treasure Chest"→ "Mission Book".

2. App version:

Please click on the "More" button on the upper right corner→ "Exercises" or "Missions" to select questions.