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Many U.S. graduate schools require GRE test results as part of the application. The GRE test is a standardised test designed to measure the abilities of all graduates, regardless of their field, in tasks of general academic nature. It is not an intelligence test. Rather, it is supposed to measure the extent to which undergraduate education has developed your skills in abstract thinking, both verbal and quantitative. In addition, it tests for argumentation skills in topics of general interest (non-specialised topics – you won’t be asked to write about the fluctuating electromagnetic fields in deep space; although if it is relevant to the question at hand, you can).
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