Best and Most Effective Way to Earn XP and Leveling Up?

                                    The most effective ways of gaining xp and leveling up are as follows-
1. Use 1 gun level it up get the attachments that play to your game style feel comfortable.
2. Best Matches are KILL CONFIRMED, SABOTAGE, AND FINALLY DOMINATION, those will give the max amount xp for the time spent playing.
3. DONT RUSH take your time, trust your feelings.
4. Use the setups i posted earlier.  
5. Always use the right gun and attachments for each map.
6. Watch the kill cams.