Rise Up, a mentoring program initiative, helps underrepresented high school students succeed in their Advanced Placement (AP) Computer Science (CS) courses and exams. The program was developed by Ericson in Georgia and over the last six years has shown statistically significant increases in participants’ understanding of computing concepts, belief in their ability to pass the exam, and interest in computing careers. While these successes have contributed to the program’s longevity, further research needs to be conducted to address sustainability and scalability, especially within new contexts and when working with new student populations in Michigan. We posit that an effective mentoring structure is key to ensuring program sustainability and scalability. Garcia and Mondisa will contribute their expertise in STEM mentoring by further examining how remote and in-person CS mentoring sessions run by near-peer undergraduate students impact students’ self-efficacy and interest in computing and engineering careers. The project will focus on holistically examining the factors that influence the effectiveness of the mentor-mentee relationships, including how to effectively train and support mentors and how to encourage mentee engagement. The project will leverage free open-source interactive electronic books (ebooks) that Ericson created for the two AP CS courses, which have already been used by thousands of students.