Can you tell me what grages or CGPA is required to get in a top law school UK/USA like LSE,Oxford,Cambridge,Georgetown,yale,Harvard etc., after i complete my 5-years BALLB course , i am a Law student from India.

Well, those are all different schools and different schools have different requirements but obviously the better your marks the better your chances. But you can generally find that specific information on the websites of each of the schools. You should independently research them very heavily to see what each school requires, and if you find something specific about their requirements that is confusing to you, maybe people can help you interpret that information. But really, this is info you can find on their websites.