Can you somehow restart a mission that you have done to do it again
Plz help

I guess no, If you did complete the mission you can't remake it (unless u create a new char)

I complete a mission that is needed to grow up and i didnt take the following mission

I complete the mission but i didnt take the following one so now my character cant grow up

If you complete one quest that allow you to grow up and u didnt took the following one then go back to the right NPC and take it.

Follow this guide : http://www.dbocom.com/forum/showthread.php?t=6339

(PS : an advice : press j delete all the quest u got its easier, at least u can focus on the one where u need to grow ^_^)

Thanks man see ya