Interview on 9th June at TCS Kolkata

I am a complete fresher having experience of 9 months that too in non technical role, shortlisted for digital role. I have not even studied anything.

Anyone please guide me what should I focus on in this remaining 4 days to be able to even crack just ninja offer.

Also I had 1 doubt, if I tell the panel I am comfortable in C will they ask me questions related to OOPS or they will grill me in C only? Please guide