Get Challenges Done Early and Pass Exams
If you head to the lower left-hand corner of Conton City, Dragon Ball Xenoverse 2’s hub world, you will find a High School where you can practice different in-game techniques and take exams to rank up your Time Patroller. Those practice sessions are called challenges, and each one gives a small bit of experience. Later in the game, the amount of experience you get from them is laughable, so you may as well get them done early on to get a quick dose of Experience.
Most of them are fairly easy, and even the ones that are a bit more challenging tell you exactly how to do them, so it’s really just a matter of patience. It will feel like a chore for a while, but, if it makes you feel better, completing these helps to unlock exams and that’s where you’ll see your first large helpings of experience.