Poorly. Not only do charter schools fail to “boost high school graduation rates or pass rates on most Advanced Placement exams. Another , released this year, found that students who graduate from traditional Boston public high schools are actually more likely than charter graduates to earn a college degree or another form of postsecondary credential within six years.”
A generally-accepted figure for 9th all the way to 12th grade graduation rates is 85% to 90%. If you're a student, you have about a nine out of 10 chance of making it all the way to graduation. How about in a charter school? The rate there is about 60%.
Who are the people backing charter schools? Basically lawyers and hedge fund managers, people with lots of money who have run out of places to invest it all in. [16 Mar 2015]
Update: Yeah, charter schools can use...um...“stimulating” marketing to get students in their doors to begin with, but that doesn't solve the retention problem.