Having a strong GRE Physics test score and English language proficiency (IELTS/TOEFL) is beneficial, but not sufficient on its own for admission to an MSc in Physics program in the USA. A bachelor's degree in physics or a related field, letters of recommendation, research experience, a well-crafted statement of purpose, and potentially interviews are also important factors that universities consider. It's crucial to research and understand the specific requirements of the programs you're interested in and to consider a variety of factors to enhance your application's competitiveness.