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Getter a better headset
Description: Get an 5.1 speaker headset if you are a CSS fan to be able to hear enemy's further than your original headset if you don't have one.
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Watch Gameplay's
Description: Watch other player's gameplay and try and use their stragety or mix it up with yours and this will help in future matches to locate where people are and how to overcome them.
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Use Your Weapon Wisely
Description: use your weapon wisely like when you try and shoot a person with an ak47 and you keep missing just change to your secondary weapon e.g. Deagle and this will help by getting your kills quicker and easier.
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That is my top 3 tips to get better at CSS
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I hope these tips help you to achieve your goal
Good Luck Soldier.