Once you have added your questions. You should try the test yourself to see how your candidates see it.
It is easy to try the test you are in:
From the left sidebar, click Try Test.
This will open the candidate's view in new window. You can go through the test or any specific question.
Your questions are also scored when you submit them.
To see how you did on the test run, head over to All Candidates from sidebar.
Find the candidate with Test tag on it.
It is always a good practice to try your test (or make another teammate go through it) before inviting your candidates.