as you have seen, if you were alone, you'd level up easy...
you have six members, and those EXP you get are divided among the six of you... so... let's say 50,000 right? 50,000/ 6 is your EXP gained for your char... and for multi-class that'd be 50,000/ 6= ANS / x (which is number of classes).
jsut clarified it for you...

oh unless the screen says player gets x amount of EXP btw, everything's divided to your party... [img]smile.gif[/img]
follow the story, and you will level up quite fast...