iMentor's College Ready Program is a unique approach that combines elements of school-based mentoring, whole school reform, and technology in an effort to help students develop the full suite of knowledge, behaviors, and skills they need to complete high school and enroll and thrive in college. iMentor partners with high schools that serve low-income students, and aims to engage every student at the school, from 9th grade through their high school graduation. Each student is matched with a college-educated mentor; students also attend weekly classes structured around iMentor's College Ready curriculum and taught by iMentor staff. The Research Alliance for New York City Schools is conducting an in-depth evaluation of the iMentor College Ready Program in eight New York City high schools. With support from the Social Innovation Fund, the Research Alliance is examining iMentor's roll-out and implementation in these schools, as well as its impact on a range of outcomes related to students' preparation for college. This report provides a detailed description of the four key components of the iMentor College Ready Program and assesses the implementation of these program elements against specific benchmarks established by iMentor. It also presents a first look at iMentor's effects on 9th graders' outcomes, including their perception of adult support, their aspirations for the future, a set of important college-related "non-cognitive" skills, and several markers of academic achievement. [For the executive summary, see ED573423. For the technical appendices, see ED573424.]