I'm currently in the 7th grade. My sister just got into Townsend and Bronx and the pressure is all on me.?

My top 3 choices are Stuy, Bronx, and Townsend, Stuy being the first. My grades are OK (94-96 ranging) and I'm planning to attend MEGA Academy in flushing, supposedly very good. A lot of the students got over 600 who went there. I've missed 6 sessions but I'm signing up ASAP. It's an intensive course and i would like some reviews on it. Also, any other tips?