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You can but it won’t necessarily reflect what you know/learned when taking the general and Physics subject GREs for graduate/professional school. Standardized exams is one of the great equalizers when it comes to applying for grad/professional school. Programs long ago realized that many variables affect gpa, such as academic rigor, grade inflation, quality of teaching/education etc. I’ll take a “C” average Physics undergrad from Caltech over an “A” Physics student from UCI any day.</p>