I’m level 79 already, but still now job Advancement.
class level 15 of Rank 3. Your base level is irrelevant.
My class wiz-cyro-cyro .I’m in rank 3 already. I’m level 79 now but still no class advancement for rank 4.
i got rank 4 at lvl 80. usuallly i wil seelevel 73-75 who are rank 4, im now rank 5, i got it at level 127
In Tree of Savior, you have class levels as well as character levels. Whenever your class level gets to 15, your class rank goes up.
So you’re now character level 79, rank 3, but what is your class level? It’s shown on the right side of your exp bar (which is located on the lowest portion of your screen). The left side says “character”, which will be 79, and the right side says “class”, which will show you your class level. When that one reaches 15, you’ll be able to rank up.
I hope I could help. 
Between 70 and 80.
But since you need rank 15 of class ( I know you know that), can be even more.
Dont waste time saving cards, that is a mith, go to rank 15 and be happy.
BUT DONT USE IF YOU ARE CLOSE ENOUGH OF RANK 15 OR ALREADY IS IT.
lol “myth”.
also, you will definitely regret doing that at later levels.
Exp cards are meant to save especially to break those exp curve like the crucial point from 150-200 at the least. I cant say most but some of us knows when to use it so that we wont have to get stuck in such mess. i mean grinding a level will probably take you 30mins to an hour depending on the places you are grinding at.
using exp cards is also situational especially on certain maps the mob lvl you are up against but best is still to save.
like he said, you definitely regret.
Well, lets see then. I apreciate the advise, but for me still dont worth it.
You lose very well a big time griding too instead focus on the quests.
Unstead you be a “damage area type” you are just making a:
“substitute time for griding on the late game”.
Yes on the last 3 levels of the class, exp curve is annoying, one more reason to use the cards if you have it.
With more level: Quests much more fast and easy, what means more cards. DG come more fast (but is good to make DG and Missions on the level based), what gives you more levels more fast.
But again, I apreciate the advise.