Marks needed for IIMs

i have 80.37 in 10th , 56.92 in 12th science now i am doing engineering. i am from NCL OBC.how much marks should i needed in engineering to get admission in IIMs.will my 12th marks affect my performance in entrance.

i have 80.37 in 10th , 56.92 in 12th science now i am doing engineering. i am from NCL OBC.how much marks should i needed in engineering to get admission in IIMs.will my 12th marks affect my performance in entrance.