For starters, the basic xp gain in ET:
Common for all classes:
Action - XP
Kill - 3
Kill with headshot - 5
Battle sense in 30 sec intervals:
Action - XP/30sec
no combat ---------------------------> 0
Receiving damage --------------------> 2
Receiving&giving damage -------------> 5
Killing&receiving damage ------------> 8
Medic:
1XP health pack
4XP revive
Engineer:
5XP for a 50% of Power Bar objective such as repairing an MG nest
7.5XP for a 100% Power Bar objective like repairing a tank
10XP for destroying an objective.
4XP for a land mine or dynamite kill
4XP for defusing an enemy land mine
6 XP for defusing enemy dynamite.
Covert ops:
3XP for each land mine spotted
5XP for disguising themselves using an enemy uniform
5XP for kill with a satchel charge
7XP satchel charge to destroy an objective.
Field ops:
1XP for giving one of your team's players an ammo pack.
3XP for every enemy player you kill with an air strike
4XP for killing them with an artillery strike
5XP for destroying an objective with either.
The key element if you want to concentrate to SL and rating is battle sense.
30 XP in 1 minute with medic without whoring and playing like crazy:
* 10 XP = 2 kills with hs (1 kill /30sec)
* 16 XP = Battle sense (receiving some damage so you get full battle sense)
* 4 XP = 1 revive or 4 health packs
So the battle sense makes the most xp. But if you just rush to enemies and for example make 4 kills in 1 minute but you die 1 time you get only 20 xp...
With covert ops whoring 30xp/min is extremely easy 'cos you can stay alive easily while disguised and gain battle sense xp + 5xp when you steal uni.