[Assassin]

you are free to take my advise or not its up to you, im not the best player out there especially since yesterday i tired to play and i cant hit anything after not playing for a while so heres my advise:
1- Think and dont just rush without thinking this game isnt only about skills its also about brains and how to outsmart your enemy to get the kill.
2- Try to watch advanced players playing, you can check that in youtube to learn strategies.
3- Learn how to strafe shoot can find it in youtube and knowing the map also helps.
4- Always keep your crosshair at head level.
5- This is self preference but i like to use AK its the strongest weapon in the game however if you find it hard due to high recoil use M4 since it has lower recoil than the AK but try to get use AK often too, and playing in deathmatch can help you learn controlling recoil.
6- Dont spray, fire in bursts like 3 bullets for AK and 5 bullets in M4 in long and mid range.
7- DONT EVER TRY TO CHEAT. Those who do they always get caught and there is no chance for them to get back.

Good luck,
hope it helps.