The best way to get you level up...
Once you have the sword of fire and the ball of fire use it to kill the giant purple mushrooms to get to about level six or seven.
When you are going through Mt Sabre after you go through Nadres...You will get to a short snowy path between the entrances to two caves (after you have passed nadres and gone through the first cave) there are 2 of the purple fan mosters. They give you 15 ex points each so it is easy to get the 1500 points you need. Continually go in and out killing them each time.
Finally once you get use of the Dolphin and boat use your sword of wind to kill the turtle shell monsters they give you 160 exp points each plus since there are five or six in the cave (the one with the one eyed oc in front of it) You don't have to reenter too often.
The best thing about all of these monsters is that if you dont touch them they cant hurt you

Happy Gaming!