The current NCLB/ESSA-generation [No Child Left Behind/Every Student Succeeds Act] of pre-service teachers in the U.S. received their K-12 schooling during the standardized test-focused education accountability era. There is little research exploring how they perceive the disconnect between their K-12 teacher-centered, test-focused school experiences and the engaging, student-centered philosophy promoted in many colleges of education. As such, this study was conducted in a public university in the Rocky Mountain Region to explore perceptions of pre-service teachers concerning the dichotomy between their K-12 test-focused experiences and their developing student-centered teaching philosophy. Utilizing a mixed method design, this study employed a survey (N=210) in which participants reported that they were influenced by K-12 instruction focused on standardized testing success. Additionally, qualitative data, including student oral and written reflections (N=52) exemplified PSTs' [pre-service teachers'] implicit apprehension concerning their ability to prepare students for standardized testing success while maintaining a desire to implement engaging student-centered learning experiences. The significance of this study lies in the establishment of a foundational dataset concerning the teaching disposition of NCLB/ESSA-generation PSTs.