What are my chances?

Chance Me / Match Me!
1

Okay so I am currently in high school, and I want to transfer colleges when I get to college. I was hospitalized frequently throughout high school, so my grades aren’t so well. My plan is to transfer to an Ivy League school such as Yale, brown, etc. I know the odds of getting in are pretty low, but would it decrease my already low chance of getting in if my grades in high school weren’t so good? Also, i may not be able to graduate until January due to credit transfer, so would starting college in the spring semester instead of fall negatively effect my chances of getting into a school if I wanna start as a junior? Would I be better off starting in the fall term of the next year? Please give me accurate answers, thank you.