Head of the Class Ribbon ~ Question

Hello and sorry if i'm in wrong section, i just didn't know where to place this question..
anyway..

Can someone tell me how do i take the "Head of the Class" Ribbon?
It says "You have maxed 1 Class in Wave Mode to Level 10"
What that means? i have to be at least 10 level in Wave Mode or i have to enchant a class (like Blaster) to +10 ?
or what..

Please someone explain me..

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