While the GRE Physics test showcases your physics knowledge, it's typically not the sole determinant. Admissions also consider your overall academic background, recommendation letters, and statement of purpose. For international applicants, IELTS/TOEFL scores are important to demonstrate English proficiency. However, a BSc in Physics or related field is usually a prerequisite for an MSc in Physics in the USA, as it provides the foundational knowledge required for advanced studies. Strong GRE Physics scores and English proficiency can bolster your application, but a relevant undergraduate degree remains a key factor for admission to most reputable MSc Physics programs.