I want to share this table i found on a PSN forum i want to thank Onousfan por posting it, im level 25 on the leader class so i can confirm this table is accurate
1 - 500 XP
2 - 1,500 XP (+1000)
3 - 3,000 XP (+1500)
4 - 5,000 XP (+2000)
5 - 7,500 XP (+2500)
6 - 11,000 XP (+3500)
7 - 15,500 XP (+4500)
8 - 21,000 XP (+5500)
9 - 27,500 XP (+6500)
10 - 35,000 XP (+7500)
11 - 44,000 XP (+9000)
12 - 54,500 XP (+10500)
13 - 66,500 XP (+12000)
14 - 80,000 XP (+13500)
15 - 95,000 XP (+15000)
16 - 112,000 XP (+17000)
17 - 131,000 XP (+19000)
18 - 152,000 XP (+21000)
19 - 175,000 XP (+23000)
20 - 200,000 XP (+25000)
21 - 227,500 XP (+27500)
22 - 257,500 XP (+30000)
23 - 290,000 XP (+32500)
24 - 325,000 XP (+35000)
25 - 362,500 XP (+37500)
The best Gametype to gain xp is Conquest since you get 150 xp for capturing each power node.
on average on a good game you can get 4 to 6k xp ---
since july 2011 theres permanent 5x XP so this can me done much faster