I see some ppl have like tricks and knows when to use exp cards does anybody know exactly when to use them and so on please help me ? thanks.
Well, what I know its that you might face some “exp barriers”. Like when you hit level 45. From level 45 to level 46 its hard to level up. So people try to gather some Exp cards to pass these barriers easly.
In this level 45~46 example,if you do the quests and side quests correctly, you might have around 60~90 level 3 Exp cards( If you haven’t used any ) and that is more then enought to transpass this barrier! 
Take a look at this EXP table here. http://www.tosbase.com/game/exp-tables/base/
I’m not exactly an expert on the usage of cards but from what i’ve heard, you simply use cards to keep up with the reccomended level of the area you’re in. Once you reach lvl 47, 87, 137, 187, 237, the exp “barrier” is essentially broken and the required exp needed to level lowers immensely.
