you will need to be evaluated by the track day organization staff to be upgraded to any class. to be upgraded to advanced, you will know the lines, are predictable, and can maintain a speed equivalent to the groups speed, and be comfortable both in close passing and passing close all while riding safely within your limits.
in my humble opinion, if you are still working on lines and speed, grab a track coach, and ask for one on one help, and evaluation for the next level group.
it is a recipe for disaster to bump yourself up. some track day orgs, if they find you bumped up, and cannot back up your claims, and safety on the track, will sit you down, up to and including not letting you ride with any group for that day, or suspending you from further riding with the org.
your results may vary. Ski
May we all, get to have a chance to ride the fast one, walk away wiser when we crash one, keep hopin that the best one is the last one.