How do you practise?

Everytime you start csgo before go play some competitive match open the mapAim_botz, enter and put some random bots and get ak-47 and kill how much you can in ashort time for 15 - 30 minutes after that you can play some competitive match m8. My friend do that, he was legendary eagle master. You realy need to spend a lot of time to be a good player on csgo.