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Well the short answer is - don’t worry about the minimum needed to “do academic work”. If you get in, technically you can “do the work” partly because there is a big range of “acceptable work” (e.g. from A to D). The tricky part is that for some individuals, the minimum required for “the work” wouldn’t necessarily get them in. This is a competitive process and the schools routinely turn down “acdemically admissible” applicants.</p>