Hello staff team, my friend Nomura Hisaku L. (Nqnnq) is stuck at grade 8 and cant rank up or get older i would be so thankfull if you help her..

Hello Staff team, My ingame name is Shi****romo Senju (X_ChaosSkill_X) i played 20 times the grade up for grade 10 but still it says Maximum Grade reached and i dont know why i am so Thankfull if you can help me.