The Ranking System is like that of rpgs, you gain XP through dueling other members and winning. The higher ranked the member you beat, the more XP you get and vice versa. The Ranks are as follows:
Jedi Ancient = +100,000,000
Jedi Council = +40,000,000
Jedi Master = +10,000,000
Jedi Defender= +5,000,000
Jedi Knight = +1,000,000
Jedi = +500,000
Apprentice = +250,000
Padawan = +70,000
Initiate = +25,000