Maybe a bit late to reply. About the only math I use is basic set theory which I learned back in 5th grade. First-year algebra was 8th grade, followed by geometry, second-year algebra with series, trigonometry and starting calculus. Along with trig was analytic geometry which took me some time to grasp and was used as the basis for beginning calculus. I dropped calculus senior year HS which was a major mistake in that it was next to impossible to learn in a college setting. There never was a way to know when to integrate by parts, partial fractions, u-substitutions or miscellaneous substitutions. Trig substitutions were sometimes obvious; I recall the professor's scowl when students groaned when trig identities were used as substitutions. "This is mere child's play!"

Except for geometry, virtually no attention was given to mathematical proof. I had no exposure to inferential statistics until my third year at university which is typical of the social sciences.That was also my introduction to SAS of which I was an instant convert after taking FORTRAN as an engineering student.