If you’re preparing for SOA Exam C or CAS MAS-I, building and optimizing actuarial models using R is a skill that will not only help you pass but also make your work in actuarial science much more efficient and insightful. R is a powerful, open-source programming language widely adopted in actuarial science for its flexibility, extensive statistical libraries, and strong data visualization capabilities. In this article, I’ll walk you through practical steps to build and optimize actuarial models in R, sharing tips and examples drawn from experience.