Hey !

I would like to tell you that mumbai is full of colleges for different courses . And as you have mentioned the MCA choice code   then it could be better if you would have mentioned the exam name also..

Although your question is unclear  , still you can check the choice codes of all the participating institutes of mumbai under ATMA by following the given link;

https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.atmaaims.com/pdf/ATMA_participating_institutes.pdf&ved=2ahUKEwiE9tjq3arjAhUENY8KHbRlDuUQFjAAegQIARAB&usg=AOvVaw0yuI852ywdPbNhkdA0fONQ

Hope it helps!