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All dates come directly from the official sources: SAT from collegeboard.org (2027–28 dates are the College Board’s “anticipated” dates), ACT from act.org (2027–28 dates are ACT’s “projected” dates), ISEE seasons and registration rules from E3n (iseetest.org / admission.org), National Merit rules from the official PSAT/NMSQT Student Guide. Last checked Oct 5, 2026. Always confirm registration on the official site.