Answer:
These are needed to finish a test
What time starts and stops with an “n”?
What is often on the ground getting stepped on by others, but you don’t have to wash it because it never get dirty, in fact you couldn’t wash it even if you tried?
Never ahead, ever behind, yet flying swiftly past; For a child I last forever, for adults I'm gone too fast.
What is it that after you take away the whole, some still remains?
If it’s information you seek, come and see me. If it’s pairs of letters you need, I have consecutively three. What am I?