CAT

You can use JEE Mains college predictor for more insights about the shortlisted colleges based on your rank.
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor

Other than CAT, you can write XAT/CMAT/MAT/SNAP/TISS/NMAT/IIFT to get into top B-Schools of India. if you are looking for MBA in HR TISS is one of the best institute. Symbiosis colleges select through SNAP. IIFT conducts its own exam for 2 locations Kolkata and Delhi.

Look, it's totally up to you if you think you can prepare again and score good marks then its fine. If you think while doing a job you may not be able to do it then go for the admission as it will add value to knowledge and experience.

Yes Partha, you can give exam in your final year of UG. For applying to IIMs, you'll have to use your score till 3rd year.

You can get colleges like LBS-Delhi, IMI-Delhi, IIT-Roorkee/Madras, NITs, FORE-Delhi, IFMR, SIBM-Bangalore (through SNAP), NMIMS-Bangalore (through NMAT), IMS-Mumbai, SIESCOM-Mumbai, K J Somaiaya-Mumbai.

Hi Bhumit,
Your past acads do not matter at all.
You need to score in excess of 99.6%ile to stand a chance of converting the admission interview.
No preference for Chartered Accountant.
Any reason there should be any preference?

Hi Abhishek,
This is because FMS Delhi ranks better than most of the IIMs in all respects.
Additional favorable factors is its location (Delhi), low fee structure, stellar Alumni, amazing placements, etc.

Basu, certain average colleges offer you admission without CAT but then they don't talk of placements.
The best like IIMs, etc take admission with CAT only.
Certain private ones like LPU, AMU, BMLMU, etc offer admissions with CAT/XAT/MAT or their own tests. They even have good placements.
Check with institutes for more information.
Good luck.