Could I make the girls' 7th grade basketball team?

I am in 7th grade, and I am 12 years old. I weigh 106 pounds, and I am 5'3". I make pretty good grades in school. I tried out for the 7th grade athletic period (its like P.E, but u get athletic training,basketball skills, volleyball skills, etc.), I did not make the athletic period but the coaches said that I could still try out for whatever sport I wanted to if I didn't make it. I never played community/city/youth sport basketball either. But, I have been practicing alot. My brother who is 21, played basketball in high school and said that I was pretty good/good enough to make the team. The basket I practiced on is a bit lower than the basket at my school, but I make alot of shots. I can run fast when I have enough adrenline/want.I REALLY want to make the girls' basketball team. I am really serious about it, when I tryed out for athletics in 6th grade i wasnt serious about it, really. Now, I am.I can dribble with both hands, I am good at jump shots and free throws. I'm not good at layups, though.I currently play softball (city/youth) in the 12U division. There are about 60 girls in athletics, and they all have to try out even if they dont want too. Alot of the girls are good too. I want to make the team soooo bad. some tips would be nice!