Examination app concept

The motive behind to make the UI for a e-Examination app is pretty understandable.
Due to pandemic, many companies are pushing the concept for a virtual exam monitoring app. But many students find it difficult to use.
Some apps use dynamic colours such as red or black , Students who give exams are likely to be in a bit of pressure and stressed.
Colours such as shades of blue would help students calm down.

Thoughts?