Are homeschoolers prepared for college calculus?

Christian P. Wilkensa, Carol H. Wadea, Gerhard Sonnertb, and Philip M. Sadlerb find that, "compared with students who received other types of secondary schooling, students who homeschooled: (a) were demographically similar to their peers, (b) earned similar SAT Math scores, and (c) earned higher tertiary calculus grades."