It takes 37,000 XP to reach level 25. I tend to play as Support. But the trick is, play as support! Use your med kits for your team, not just yourself. You get xp for healing teammates. Use the mortar strike on buildings where a group of enemies or a sniper is in, it does A LOT of damage if it gets close and is an instant kill if it hits them dead on. A good weapon would me the M60 as it is fairly accurate and does very good damage, it is a Find All Five weapon and the code is:try4ndf0cov3r. Also, the MG32 is a great LMG that has a red dot scope and if fired in bursts can lay waste quickly. If you're playing Gold Rush, go for the crates! Use C4 or a tank to damage the crate s you get 30xp for damaging the crate twice and 30xp for destroying it. If you're playing Conquest, go for flags. 30xp for capturing a flag at the back of the map? I'll take that. Go for trophies too, they will make sure you won't get bored. Good luck!