When training you use one of two methods: Meso Training or EXP Training. Meso training is when you kill only one shot monsters for more exp then if you were to double it and compare it with a monster that takes 2 shots. But if you were going to kill 2 horned mushrooms then it would 70 EXP. For example, a horned mushroom gives you 35 EXP and a Zombie Mushroom gives you roughly 42 EXP. It usually takes a low level magician to kill it in 2 shots.

Thus, giving you more exp for less magic points but it taking a bit longer to level up. It's also called meso training because you save mesos in the long-run so it's a good way for saving up. The other one is a bit of a rushing method. It's very simple. You just train on any 1 or 2 shot monsters killing as many as you can at a given time ignoring your magic points. It is a useful way for leveling quickly.