after 12th I have 3 year gap and I've completed bba am I accepted? or allowed to iim?

Manoj, there are 20 IIMs and each IIM has oys own selection criteria though CAT is the entrance examination for admission. IIMs shortlist candidates for the interview stage based on their own criteria, which may be independent of each other. The process may include Written Ability Test, Group Discussion, and Personal Interviews. Performance in the CAT examination is an important component in the admission process. IIMs may additionally use other factors such as the previous academic performance of the candidates, relevant work experience, gender and academic diversity and other similar inputs in shortlisting and ranking of candidates at various stages of the admission process. The processes, academic cut-offs and the weights allocated to the evaluation parameters may vary across IIMs.So if there is a valid reason as to why there has been a gap in between your 12th and Bachelor's degree and if you can score more than 95 percentile on CAT, you might have an opportunitity at an IIM. IIMs need diverse academic profiles and so if there is a reason for a gap in your studies, it should not be a problem.