I think it's worth getting access to Premier mode because you get the full CS experience with access to all modes. In classic competitive mode, the usual old ranks such as Silver, Gold Nova, and Global remain. But in Premier CS2, there is a completely different order. For more information about
VRedux Premier rating article , take a look there, where everything is described in detail. As for Premier, when you purchase it, you will also need to reach level 10 in CS2, which is the minimum. Next, you will need to win 10 matches, and after that, you will start receiving a Premier rating. The better you play, the higher your rating will be, because almost all of your skills are taken into account.