How to deal with a nagging child?

You have to stop some old style of approach or treatment for her. It is time to introduce to her new treatments of approach, new styles or new of routines to motivate her for good attitudes and character buildings. To focus her attention on other more creative and productive things that are good for her life ahead. Like, firstly, is you have to personally talk to her teacher at the school. Ask her teacher's assessment to your daughter. How she is doing in class and with other of her classmates. What needs more improvements. And also have consultations with her teacher or even with some of your personal friends or with other persons that might help you, about your daughter behaviors. Have a friend of your daughter or other kids to have some enjoyable group studies. Or make the study a fun atmosphere. Give her favorite happy snacks after finished studying or doing her assignments first. Giver her rewards (like new toys, etc.) when her grades or good and satisfied. It is also very good when you make your daughter always busy. Like doing self-improvements skills/talents. Train her into sports or in singing, dancing, acting, modeling, arts, and so on. And, most of all this hard to do. Self-discipline. Like, time management. Early time to sleep, early time to wake-up in the morning. Nap in mid-afternoon. When to take a bath. And, when to play outside.

Just treat her with love ..try to be a friend with her..make the study as interesting as playing so that she doesn't feel the study boaring.

@debjani1 I wish I knew the answer. I don't have any kids of my own but I do love watching a show called Super Nanny. She deals with child who misbehave. Teaches parents how to deal with their children when they aren't listening or messing up etc. Maybe would worth watching if you wanted to.

whenever my daughther will have that mood i let her understand that if she will give me a bad behavior that is what she will get from me too. so she needs to be good and just let me know nicely what she feels and want.