This document summarizes the teaching internship experiences of Jasper A. Santiago, a 4th year student studying Bachelor of Secondary Education majoring in Mathematics at Nueva Ecija University of Science and Technology. It discusses his beliefs on teaching and learning before and after his internship. It also reflects on the key areas learned during his internship, including differentiating instruction, participating in school activities, and various approaches to assessment. The internship provided valuable practical experience and an opportunity for critical self-reflection to help develop his skills and identity as a future teacher.