Explore the design features of a preparatory physics course aimed at supporting student success in introductory college physics. Learn about innovative approaches to course activities, policies, and infrastructure that promote learning, belonging, growth mindset, peer collaboration, and mentorship for approximately 350 students. Discover how research in education and psychology informs the course design process, addressing challenges faced by STEM students during their transition to college. Gain insights into mastery-based homework, frequent low-stakes assessments, improvement bonus points, and strategies for building social connections among students. Examine initial findings on collaboration in the course and future goals for enhancing group work. Consider how these design principles can be applied to support student success in various academic contexts.