Hi People. Have you ever been on a PvP server and realized "Man i stink at PvP?" well ive had the excact same problem. I want to Make sure you guys dont. Heres a few tips i use now a days when i PvP on servers.
1) Always bring food To The Arena With you Just In case.
2) Always put Your Valuable Items In a chest Before PvP starts.
3) Have 2 Trusty swords with you always. they tend to break very fast in PvP.
4)When Your at Low health sprint away from all the others and eat.
5) Use Your surroundings To Your advantage.

I hope This Really helps all you pvp people in the arena. Some Of this i've learned from some Ju Jitsu classes But It can Be helpful in pvp as well. I hope This really helps some of the new crafters or People That have recently bought minecraft Because we all want to have fun on any type of server dont we? Well comment If this helps at all :)