F1 23

The naming of this is a bit misleading. This is the ranking of your driver license in F1 World. Basically you level it up by putting in clean laps. It gets levelled down by non clean laps, collisions, warnings etc.

Check your current rank (You may have to complete the introduction to do this)
Go to F1 World -> Play -> Solo and Multiplayer Events -> **Pick an event under Solo (e.g. Quick Race (Americas))

You will be able to select a license level you have unlocked. Scroll down and on the right you will see a progress bar under the license letter showing you how much more XP you need for the next level. You don't have to play this event if you don't want to.

Levelling up your license
Basically as above. You can play Solo, against the AI or general multiplayer. The quickest way to level is by stringing clean laps together. As you level up you'll be automatically placed in the next division. I found B a bit empty. A is the most populated but has good drivers. This can be a benefit as a back marker you don't get involved in the ruckus.

All in all it didn't take long to unlock. Can probably do this over the course of a day if you have time.