<p>It could be that those without any calculus credit are those from situations where they had no access to a decent calculus course in high school or a local college, or where a middle school placement decision kept them from reaching calculus in high school, but whose records otherwise show strong ability in math (A/A+ grades in math (honors if available) courses, 800 in SAT-R and SAT-S math tests, math competitions).</p>