Skill, Level, and official and nonofficial servers.

1) Is skill level update exactly after match or after some time?
2)I need to play for both marines and aliens to update skill level? Or i can just play one match as marine and grow up?
3)Is ALL servers in list allow me to gain Xp to increase skill level? If not - how to understand where is OFFicial servers???

Just a question... I done my best with 46/11 K/D ratio as marine and winner. But no update on Hive...