Answer: Each of these columns are grading terms within the year-long academic calendar. Each P term represents a Progress Reporting term. Each S term represents a Semester term. P1 represents the first 6 weeks of the first semester.
The 3 P's in school stands for: Preparation, Purpose, and Proficiency
Explanation: I'm positive that I got this correct, if not, I deeply apologize for this wrong answer to this question.