To meet statewide graduation requirements and receive a diploma, Pennsylvania high school students now need to demonstrate career or postsecondary preparedness through graduation requirements outlined in Pennsylvania's Act 158, which went into effect starting with the Class of 2023. Two of the five graduation pathways--the Keystone proficiency and Keystones composite pathways--require demonstrating proficiency on Pennsylvania's end-of-course subject exams for Algebra I, Biology, and Literature, or "Keystone Exams." In December 2020, in anticipation of this policy shift and the need for additional Keystone performance monitoring and support, the School District of Philadelphia's (SDP) School Board adopted and began monitoring the goal to increase the share of students who are proficient on all three state high school assessments by the end of their 11th-grade year to 52% by August 2026. To better understand District Keystone proficiency rates and to improve them, it would help to know more about when students take Keystone-associated courses and exams and how they fare. When do District students typically enroll in these courses? When do most students take their Keystone-associated exams? And how do students do in their courses and upon their first exam attempts? This brief aims to address these foundational descriptive questions about the "when" and "how" of Keystone exams in the District.