What advice and tips do you guys have to help rank up pretty quickly?
As of now I am getting the 100 kills with each sniper.

Play Domination and Head Quarters. I haven't done it myself, but a lot of guys just camp out and get their kills while their team mates are trying to get the objective. You can camp a little way out and get your kills pretty easily. These game types offer a good deal of points also...

Fastest way to get challenges is HQ... with snipers though id say deathmatch.

Otherwise the quickest way to rank up in SnD

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Yeah HQ is very good for ranking up, even if you are a poor player but your team wins you will get 250 points from the HQ and that's before your match bonus and kill points etc.

search and destroy or headquater gets you the most points

Wait, how many points per kill is HQ? S&D is 50 but the tradeoff is one life per round...=(

The fastest way to rank is to play headquarters or search & destroy. Then in the games just camp in one spot with UAV jammer and get loads of kills. Basically doing the annoying stuff in COD gets u to level faster

yea the quickest way is do hq with uav jammer just camp and kill thats what i do

Headquarters is probably the fastest although I prefer to play TDM because it's a little bit less agrivating if you don't have a good team to back you up.

I agree. I tried out HQ today and I leveled almost 10k exp in 4-5 hours. It was a nice increase in my rate after playing Team Deathmatch for like forever.