is the question correct?
What time exactly must they be starting the test proper.? ( there is a previous exercise which does nit belong to the test itself)

Do I have to get them to start at the exact time or just approximately?

Thank you

Question

is the question correct?
What time exactly must they be starting the test proper.? ( there is a previous exercise which does nit belong to the test itself)

Do I have to get them to start at the exact time or just approximately?

Thank you

Answer

For the first, I would say "What time exactly must they start the test itself?" Saying "the test proper" is acceptable in my opinion, but it sounds less natural and I'm not sure everyone would understand it. The second question is great.