Will there be any problems faced by students in communication in ISI Kolkata?

As one of my friends is from ISI Kolkata, let me share some of her experiences about it, which might give you a clear idea.

• During his initial and first ISI stay back in 2016, he met a few summer students from Kerala.
• That was when he had a chance to work around any sort of language barrier. 
• It is to be noted that Indians will be able to get by easily, especially because Indian languages share a lot of similarities. 
• Non-Indians, particularly those from beyond the subcontinent, may have more difficulty, but I believe non-Indians are uncommon at the college level.
• Almost everyone on campus speaks English and/or Hindi. 
• Students and teachers, with the exception of a small minority, speak functional English.
• A few gestures may be required while interacting with non-teaching staff. 
• Off-campus merchants and service providers frequently speak basic Hindi, which can be witnessed with gestures. 
• This is analogous to how in Chennai, English augmented with a few basic Tamil words and gestures suffices.
• Furthermore, if you already know Hindi, Marathi, Gujarati, Sanskrit, or any comparable language, the Bengali language would be easy to learn. 

As a result, the vast majority of linguistic backgrounds in India are covered. Eventually, there's a low likelihood that an Indian from another state will have serious communication problems.