The study, conducted by the nonprofit Workforce Strategy Center, found that many community college systems fail to adequately meet the needs of their diverse student populations.
Julian Alssid, co-director of WSC, said community colleges have to balance many different goals, making it difficult to fulfill all students' needs.
"They have to prepare students for four-year colleges, (technical) jobs, remedial programs and businesses," he said. "We found the disadvantaged get hurt."
But Alssid said the N.C. Community College System could serve as a model for preparing students for a wide variety of paths.
"North Carolina stands out as one of the very few states that are making a difference," Alssid said.
Closely evaluating the progress of students and the effectiveness of particular colleges enables the state to run a top-notch system, said Fred Williams, executive vice president of the N.C. Community College system.
Each community college in North Carolina is evaluated in terms of basic skills, the number of students who transfer to four-year colleges and licensure exam results, Williams said.
"If we fail to meet a benchmark we have to provide a plan of how we will improve that area," he said.
State community colleges ensure that students not only get a quality education but that they are being taught usable skills, Williams said.