Like someone else said, get the health packs unlocked and once you do that, continuiously drop health packs near the mcom stations. and then go out and do your thing. while you are killing you will just rack up heals. If there are any bottle necks in the map you are on, put them there as well. for instance on the new rush map, one of the last mcom stations, where you have to come out of the river up a hill, or go accross that bridge that most of the time quickly gets destroyed, well drop them all over that area and itll get a lot of points.
for me, the mdic class is the easiest class to just rack up points. I love the 249 and its 200 rounds, and Im like a sniper with it with the 4x optical.