I'm redoing the exp because the numbers reached absurdly high at low levels.
From levels 1-10, you start with needing 250exp and for each level, it increases by 20
Once you get a class the amount of exp needed changes depending on the rarity of the class.
For each level up from 11-20 the number of exp increases by 35, and from level 21-30 it increases by 55 for each level up not adding Class rank exp multiplier.
So for a common class from level, 11-20 the players needed exp would increase by times 2 so it would look like (430+35)*2 or a player needing 930 exp for level 11.
Then from levels 21-30, it would look like this (17015+55)*2 which is 34140 for level 21.
Each class is ranked:
Common is rank 2 and adds 2 to the exp multiplier
Uncommon is rank 3 and adds 3 to the exp multiplier
Rare is rank 4 and adds 4 to the exp multiplier
Super Rare is rank 5 and adds 5 to the exp multiplier
Legendary is rank 6 and adds 6 to exp multiplier
Remade it this way to keep things simple.