Hello Sumit. I would like to tell you that most of the top colleges checks the whole academic profile of candidate i.e his class 10th marks, 12th marks and his graduation level marks along with the CAT score he/she has achieved. If you consider colleges such as FMS, IIMs , then only exceptional cases can be considered where you have a very sound work experience in a particular field. Otherwise, it becomes difficult to get admission in top colleges without having a solid academic background. I hope you found this answer helpful. Good Luck.