"D Class's student don't want to live anymore. that she picks a quarrel with teacher and senpai of class at fighting court" -> "D Class's student does not want to live anymore if she is picking a fight with The Teachers at the fighting court"
"the one who said me like that before still in the hospital" -> "Those who have talked to me like that before are still in the hospital."
"So you haven't recovered yet, i did overestimated you" -> "So you haven't recovered yet, it seems i did overestimate you" / "so you haven't recovered yet, it seems i did overestimate your abilities"
"It's right, the one harmed Ning Fan is in legend" -> "That's right, the one who harmed Ning Fan is a legend" ? (may be missing context here)
"I just knew i have not recovered yet, how can she look me out" -> " I just found out i have not recovered yet, how does she know that?"
"we have become better due to him, i don't allow you insult him" -> "We have gotten stronger due to him, I won't allow you to insult him!"
"haha, you said that you're very good? dont you dare to fight with me?" -> "haha you say that you have gotten stronger? Do you dare to fight(spar) with me?"