Taken from TOS base:
Total exp needed to reach level 200 (current cap): 206,073,120
Total exp needed to reach rank 6 and class level 15(current cap): 285,157,179
Seen the database of monsters at TOS database, monsters seem to give 100% character exp and 75% class exp, so 100 common exp and 75 of class exp.
Looking at cards. Cards seem to follow a similar path. Level 1 card is 500 exp, 385 Class EXP.
Seeing how class exp is higher than character exp and how the exp gain favors character exp and not class exp I am seeing a future about parties gathering to farm class exp, reaching level 200 and not having unlocked rank 6. Further on, mobs barely give any exp and only a small list of them give more class exp than common exp. This saddens me.
Seeing this I suggest the following:
Low character exp and high class exp giving mobs. Many people like to grind monsters for exp.
Class exp only exp cards given as mission rewards. Be it pvp rewards, be it as pve rewards, when finishing a dungeon or untradeable special monster drops.
Class only experience boosts. Sold at the iCoin shop, it’ll add 100% more class exp.