Practise Tactics (Solo and/or w/team)
There are many ways to complete this step. Everything from a community server to a Deathmatch game. Start of as CT, find good spots, practise grenades and smokes.
I myself always have escape ways and hiding spots in every situation, in almost every map. It's all about discovering, if you have time of course.
Warmup
Warming up is the golden tip here.
i will become a good player