If you want your Master Form up to lv 7, then read on. First go to the Crystal Fissure in Radiant Garden (Hollow Bastion, you had to beat Demyx there for the second time to get to the Crystal Fissure). Anyways, go out to the Ravine Trail and put on Master Form. Kill the Morning Stars (the giant green spikey dudes) and they drop giant drive balls which give you 3 experience for Master Form every time you pick one of them up. Then keep going until you get to the end of the trail. If you had enough drive bar, run back to the Crystal Fissure, and go to the world map if your still in Master Form. This will put your drive gauge up to max and you can keep doing that. If you didnt make it in time, then go to Olympus Colloseum and enter one of the tournaments, then immedeatly quit and you will have full drive, then go back to the Crystal Fissure and keep doing that. Well happy Master training! Hope I helped!