Massachusetts Gov. Deval Patrick's administration is considering an overhaul of the college student health insurance market intended to improve coverage for thousands of Massachusetts students who now have plans with limited benefits. The administration is looking at several steps, including encouraging schools to band together to purchase higher quality plans at a significant discount, and requiring insurers to offer more generous benefits to college students, officials said. The state Division of Health Care Finance and Policy recently issued a report that revealed that insurance companies are racking up much higher profits on health coverage sold to nearly 100,000 Massachusetts college students than on plans available to the general public.