Charter high schools largely serving low-income, first-generation, Black and Hispanic students have long boasted of the comparatively high proportions of their students who graduate and go to college. But as these schools and their alumni grow older, charters also are looking at their rates of degree attainment, which remain lower than they'd like. In response, several leading charter networks, including Achievement First, Bright Star Schools, Knowledge Is Power Program (KIPP), Summit Public Schools, and Uncommon Schools, have been expanding two key aspects of their high-school programs to promote alumni success on campus: detailed data tracking and analysis, and hands-on counseling and support. The National Student Clearinghouse's Student Tracker reports whether and where graduates enroll, attend, and complete college. This information is helping charters find and address shortcomings in the way they prepare high-school students for postsecondary success. Charter schools have expanded their alumni-support services to address low rates of completion, including by following their graduates to college campuses and providing advisors, mentors, and ongoing advocacy to raise the odds that students will make it to the finish line. College-access counseling is growing to become college-completion counseling, too. These initiatives are too new for long-term impacts to be measured decisively, especially considering that postsecondary success rates are computed over six or eight years. But they apply tools that have been separately shown to increase completion among students who are low-income, first-generation, and ethnic and racial minorities, such as encouraging them to attend more selective institutions with greater resources and supports. Funding for this work is covered largely by private philanthropy, though there are ongoing discussions with partner universities to share the costs, since they also share the benefits of improved success rates.