I see where you are going with this essay. But you took too long to get to the point. Maybe cut down something at the beginning?
Two people I was least acquainted with in the class
, and I had to work with them.
I took on a - not to be pretentious - leadership position.
^ sounds kind of awkward to me, maybe say something like: I took the first initiative.
told them I was doing the introduction, and the before-after observations of the stellar outburst; they had to do fluctuations in luminosity and the application to light blue variable stars. I recognized the importance of teamwork and I didn't coerce Bryan and Abhiram into doing the work.
^ HOW did you recognized the importance of teamwork? You might want to show it and not tell.
You have a lot of solid stuff here! Nice job!
Please take a look at mine when you get the chance!