Any way to gain levels quick?

[blackmatter615]

+XP/+%XP items, 4 minute turns, adventure somewhere you can generally survive, +hp/pp depending on if your class has good healing abilities or not.

[Muhandes]

In addition to the above, when you get to level 9, you will gain access to the cube. The cube is the best XP location due to a 300XP noncombat, so buff noncombat as much as you can and choose the 3rd option on Intermission (unless of course you get the 4th UR option, in which case choose that of course )

[Cristiona]

+XP/+%XP items, 4 minute turns

There's only so much of that you can manage at level 8, though.