Hello dear, 

BIBS kolkata is a private institute approved by AICTE and UGC. it has been accredited by NAAC. It is affiliated to vidyasagar university, midnapur. Admission in it are given on the basis of score obtained in CAT/XAT or MAT. It is quite a good institute. For more information visit: 

Https://bschool.careers360.com/node/45902/course/146850 

As you have inquired about how to apply for MBA batch of 2018–20. If you are preparing for an entrance exam like CAT , MAT or XAT then depending on your percentile you will get the options of B schools and according to that you have to sit for the Group discussion and Personal Interview.

And if you are not planning for an entrance exam then in that case the B Schools have their own written test and personal interview. But the application for MBA 2018–20 has started.