My understanding of the multiclassing system is a little vague, so I wanted to clarify. If I was to use multiclassing to level up, and increase my overall level, how does the exp get dispersed between the classes? For example, If I was say, a level 3 fighter, then I took on another class, this would bring my overall level to 4.
Does each class work individually in terms of exp? I.e. I might need 3000 exp to level up from level 3, but only 1000 exp to level up from level 1.
Or does it work in an overall sense? A level 3 Character (multiclass or not) requires 3000 exp to level up to level 4, and can then choose what to spend the level up on?