A time in a student's high school career during their 11th grade year in which the individual participates in "tryhard" activities. These include, but are not limited to: working extra hard for a board/ officer position; kissing up to teachers for rec letters; and overall being tryhard in classes.
Sometimes abbreviated to JTS (coined by ALC)
She is really trying to get president of that club, it must be Junior Tryhard Season.
A time period during a student's 3rd year of high school where there is an extreme focus on trying hard in classes as well as going for all leadership positions in clubs and activities. It often characterized by extreme stress, many applications, and insufferable try-harding. (Also sometimes called JTS for short)
She is really in her junior tryhard season with the way she's kissing up to the teacher.
Junior tryhard season is so tiring with all these applications and effort!