Hi,i have 90% in 10th and 85% in 12th but 55% in b.tech does it effect my admission to top iim if i SCore a very high percentile in CAT exa

Aayush iim give weightage to different things like cat score, graduation, experience extra curricular activities etc. if you score high in cat you can get selected unless your score does conflict with another student who has scored same as you and has better academics than you.