Hello Ankit

For admissions in top IIM like A or B, 10th can be considered only if others have higher than yours.

Quite a bit, dream recruiters like McKinsey will look at your 10 12 Graduation scores to give you an interview call.

To secure the best placement in Consulting or Finance you need a 90 90 90.

But be practical, very very few people have those scores.

90 80 75 can be considered a decent enough score.