1. Get as much kills as possible. more kills = more EXP. You can get more EXP in team battle than single battle.
2. Minimize your deaths. You will get minus EXP with each death.
3. Do not team kill. Each team kill is minus EXP.
4. You wil get more EXP by killing enemies via headshot, knife or slash, ang grenades. You also get more EXP from double kills, triple kills, and special force (4 kills).
5. Using special items. you will sometimes get free items like Double EXP or Double up. you can also buy these items from the shop.
Basically, play more games to gain more EXP!
SF Ranks and EXP Chart: viewtopic.php?f=35&t=127
