Off-campus. It was easy as the areas I studied at IIT were the same as the work required. There were multiple rounds of telephonic and multiple interviews over on-site. You have to have some extra factor to get selected.
RF-related, total transceiver architecture, and communications.
The following metrics were computed from 69 interview experiences for the Qualcomm Engineer role in India.
Qualcomm's interview process for their Engineer roles in India is incredibly easy as the vast majority of engineers get an offer after going through it.
Candidates reported having very good feelings for Qualcomm's Engineer interview process in India.