First off the Ivy League is a sports league. That’s why it’s there. The schools are different from one another environmentally a size, urbanness, Greek life etc.
Secondly, you’re in 9th grade. Your math skills and SAT / ACT will grow as you grow in math.
Thirdly, there are kids who are perfect in every way who get rejected from not just the Ivies but others. And less than perfect who get in.
Plenty of Ivy grads aren’t successful in life and plenty of non Ivy are.
You’re in 9th grade. Slow down. Be a kid. Join the band or a sport or club. Help in the community. When the time comes get a summer job.
Yes those kids get into all sorts of schools, including Ivy.
But you need to be a kid first and foremost. This desperation for something that’s in some fashion out of your control is not healthy.