Will Summer@Brown understand that my grades were poor my past 2 years?

I was bullied and depressed, but now in a therapeutic classroom this year and have Honor Roll, all A's and B's. My past 2 years I had bad grades, but still managed to get an A in Algebra and D's in my other classes. I heard that Brown University Summer program is not selective and if you are a B student, which I am this year then you are guaranteed in. What are my chances?