I have a final exam tomorrow, so should I not take my darvocet or norflex (orphenadrine) before my final?

Tough question. If the pain will distract you then maybe consider taking them. I would be cautious however as both have the potential to make you sleepy.
Depends. Does either the darvocet or the Norflex (orphenadrine) make you drousy or "fog your mind" so you can't think quickly & clearly? If one does, keep it for after the exam; likewise, if both affect you thus. However, if pain or muscle spasm is going to distract you from concentrating on the exam, you must weigh the benefits vs the risks & take the least amount that keeps you comfortable yet mentally alert.