School accountability has been a focus for state and federal legislators for over 50 years. In 2017, Texas passed House Bill 22 to align their accountability system with the Every Student Succeeds Act of 2015. This piece of legislation gives every Texas public school a letter grade based on state assessment scores, attendance, and other factors. Schools that received a D or F, or schools that need to improve the scores of certain subpopulations, were identified as in need of targeted support. Further, these schools needed to make immediate changes to improve their state assessment scores and improve their letter grade. This exploratory phenomenological qualitative study explored how six school principals leading schools in need of targeted support made changes to their school's culture and expectations to improve student achievement scores. Data were drawn from six individual school principal interviews and were analyzed using a combination of inductive and deductive coding. Thirteen themes emerged from the data analysis: principal self-efficacy, shared mission and vision, hiring practices, collegial relationships, parents and community support, teacher capacity and efficacy, professional learning communities, expectations of teachers, mentoring and onboarding, campus-level support, parent support, student behavior, and teacher motivation and support. The findings from this study can inform district and campus leaders of the behaviors and practices utilized by campus principals to make rapid and dramatic changes in their schools to improve educational conditions for their students. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]