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Ameh, in order to have the desired effect, you need to change the slant of the essay. Rather than opening with joining the team as a fourth year student, open with your leadership role as a fifth year student instead. You can simply say:
I became the chairman of the JETS club (Junior Engineers, Technicians, and Scientists Club) during my fifth year in high school. The club focused on developing STEM skills among the students enrolled in the specialized high school field. As the chairman, I vowed to make changes to the club that would help highlight the participation of females in the field. I found the female student participation to be low. I was quite disturbed by this and sought to address...
Please take note of how I revised the statement to a certain degree that highlights your leadership role, the problem, and how you solved it. That is all you have to do in these instances. You do not need to present a second role if it is not truly a leadership role. Take the real leadership role and highlight it in the best way that you can. The prompt is not asking for numerous samples of leadership, it is asking for only one strong example from the past 5 years. This example is a true response to that requirement.
I think its a good essay, but I believe that you're trying to stuff too many things in one essay. Although, unconsciously, you are sort of listing the number of leadership position you've taken. That makes the essay lose it focus. Just stick to one position and I think the essay will be all right.