Dear Student ,

Yes , It's absolutely okay to do MBA course after BCA. And generally work experience before pursuing MBA will improve your resume to get admission in premium Institutes like IIMs

To get admission in IIMs , you need to clear CAT exam with a good percentile (99 or above)

You can check the CAT cut off details and other eligibility criteria for CAT exam :

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

If you're confused to choose which specialization in MBA , you may refer this :

https://bschool.careers360.com/articles/list-of-mba-specializations-in-india

Hope this helps !