Many researchers have suspected that dual enrollment programs where high school students take college courses will enhance
college readiness and completion. Now we have a Columbia
University longitudinal study in Florida and New York that shows positve effects from dual enrollment that helps students complete high school, enroll full time in postsecondary education, and improved probabilities of college completion. Former dual enrollment students have higher grade point averages in college than similar students without dual enrollment experience.
I have written about CUNY's dual enrollment programs and the study found more positve outcomes if students took more than one dual enrollment course. In Florida , dual enrollment had a much greater positve effect on
college success for low income students with poor grades.
You can find the study at
http://crc.tc.columbia.edu/