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Quick Answer
For the 2026 AAMC PREview testing year, AAMC lists testing windows from April through October. Registration closes two weeks before each window at 11:59 p.m. Eastern Time, and AAMC states deadline extensions will not be granted for any reason. Scores are released approximately 30 days after the testing window.
That means the best AAMC PREview date is usually the earliest date you can take seriously after confirming your school list. Earlier windows give you more room before score release, school completion checks, and possible retake decisions. Later windows can still work for some applicants, but they carry more timing risk if any school requires PREview before considering your file complete.