Hi Ekta, Scholarship depends on your full profile like Academic Score, Recommendations, SOP, LOR's, GRE and TOEFL/IELTS Scores. so your profile should be attractive to the university.  GRE score alone could not secure a scholarship but a low GRE may reduce your chances. Having a good GRE score increases your probability of selection over others.
So, try to have  315-320+ GRE for being in safe side in applicants pool.  You can read this article to know more about study in USA.
I hope that now you have a clear idea of how much to score in your GRE, if you intend to seek a scholarship to study in the USA.