Class 11th boards CBSE

What weightage is considered in college application of class 11th score. I really got bad grades due to JEE prep and now just want get into ivies .
I have decent SAT score which took in 11th itself i.e. 1580 new SAT. Are there any chances now to get into ivies my dream college is Harvard.

That is a really good SAT score. But ivies don’t accept solely based on SAT. They look into more than just SAT. Your achievements, G.P.A, Essays and LOR’s play a very important role.