The minimum percentage requirement differ from the process from which you are applying like from campus placement or off campus placement through reference so  it is not fixed.

The most important thing about this top rated consultancy and investment banking firm is that they want to look for something extraordinary in   your  CV  ,doing extremely well in your class 12th then it will be an added advantage over an average performance will not give you an edge over other participants therefore you should try for as high as you can achieve.

Hello...

To place in top companies you require a great knowledge and skills on the subject.Percentage doesn't matter it is just the assessment about ourselves.The thing here is how much you learned during your study period. But the minimum percentage to get enter into the next level is for 10th you need 60% and in the 12th you need 60%. After that pursuing any degree needs above 65%.By Overall what matters is your Knowledge and skills in solving problems and making things easy.

Hope this helps you.

All the Best for your Future..