Hi Rohit, congratulations on your CAT score. It is indeed a very good score in this exam. Generally there are two parts for applying: 

1) IIMs 

2) Non-IIMs 

For IIMs, you dont have to apply separately and all. By the score and profile, the IIMs send out calls to the aspirants for the next subsequent rounds. 

Whereas for Non-IIMs you need to apply separately for each and every college by logging on their official Website and filling up the application forms. They would shortlist based on the various criterias. 

After that you need to attend the GD round and then PI rounds of various colleges you get call from. Some colleges even have Written Ability Test also. You would be judged on various parameters in these rounds, wherein you need to perform well. 

They give an overall score to GD-PI-WAT performances and also the CAT score and weightages are provided as per the management decision, and based on the overall scores, one gets admission for MBA Programmes. 

Generally work experience plays an added advantage along with the academic scores as well. Some colleges dont give importance to academics. Some colleges dont give importance to work experience and some dont give weightage to both parameters. But it always gives an edge over other students while shortlisting. 

I will tell some of the colleges you can expect a call from are, 

1) IIM Lucknow 

2) IIM Calicut 

3) IIM Bangalore 

4) New IIMs like Trichy, Vishakapathnam 

5) Newer IIMs like Jammu and Kashmir

I will provide you our pathfinder, where in you can a lot of details and various top colleges for this score, 

https://bschool.careers360.com/pathfinder/cat