I achieved a 92% in 10th, 79% in 12th, and 82% in graduation. How much do I need to score in CAT to get into the top MBA colleges?

Hello Karam. Congratulations on decent academic scores. Now, the admission in IIMs and other top b-schools accounts to different factors. These factors include, class 10 marks,  class 12 marks, graduation marks, gender diversity, academic diversity, work experience and cat score.
So if you are a fresher and belong to general category, then you should try and get 99+ percentile in CAT. The reason being, a lot of candidates have very high academic scores, and other factors also play a spoil sport.

So,  work hard and ace the Cat.

All the best.

Dear student you secure good Mark so you can also get admission through your cat performance your cat performance is above 60 Mark you definitely get admission any college as per your choice.
Thank you
.