How will a year gap after 2 years of work experience affect the chances of getting into JBIMS?

Any gap during your career needs to be justified adequately. The gap won’t affect your chances of getting a call as that is solely based on CET score, academic performance, extracurricular activities, and work experience. It is your personal interview that might face problems due to your gap. 

The interviewer might assert that you can’t multitask or you don’t understand the importance of time as many students prepare while working. You need to note that the interviewer is not here to demotivate you or insult you. You need to give them a valid reason for your gap and if provided one, they might overlook it at once. The fact that you got a call and got shortlisted is enough justification for the gap.

Apart from your MBA preparation, they will inquire about the additional skills you acquired during that period. These may include any extracurricular activity, an internship, any specific skill or a new language you have learned, any freelancing or any course you got enrolled in. You can also be acquired about what you gained or learned from your gap period. 

I don’t personally think a gap can limit your chances provided you offer a very convincing reason in the interview.