Team Death Match (TDM) - It's a team battle in which you have to score 100 points. I recommend for people who are at least an decent player so you can get many points. My average score is like 565 exp. in TDM.
Team Battle (TB) - It's a team battle with maps where you plant (c4) and maps where you rush (reach destination). I recommend this if your a good rusher or planter because completeing the mission is the best exp. My average is 100+ not sure.
Single Battle (Single) -It's just a free for all. I recommend not doing this because it lowers your K/D Rate more.
Capture the Captain (CTC) - I recommend not doing it, it's pretty much useless unless you kill the captain. The most I ever got was like around 300.