Using US data from the Los Angeles Unified School District (LAUSD) I analyse student outcomes from Advanced Placement tests and Smarter Balanced Summative Assessments to determine whether charter school students display higher levels of college readiness. Using panel data from 2011-12 through 2014-15 for the Advanced Placement tests, I find a gain of between 10.8 and 21.0 percentage points for charter students on average over students attending traditional public schools. For the Smarter Balanced Assessment using school years 2014-15 and 2015-16, I again find that charter students outperform traditional public students on average with gains in all categories for both the English and the mathematics portions of the exam. The results of this study seem to offer some support for the view that offering choice in schooling tends to improve performance.