As part of its ongoing process to make AP course and exam materials more effective for teachers and their students, the College Board released to educators a redesigned AP U.S. Government and Politics Curriculum Framework (.pdf/3.1MB). The redesigned course and exam will launch in the 2018-19 school year.
Ideally, best times of day to supplement with creatine would be around 30 minutes to 1 hour before your training session and immediately post-workout alongside your protein shake.
However, it is merely a supplement, and is not necessary to gain muscle mass. Up to 10 grams of creatine, 3-5 grams taken before and after workouts, can help boost adenosine triphosphate (ATP) production, making you stronger during workouts, making it easier to build muscle.