The app is used for controlling and recording the entry and exit of visitors in gated housing societies, among other things. Kulkarni allegedly used the rough sheets to smuggle small chits of questions in brief and optional answers. They wrote down and marked questions on their subject books after returning to their hotel rooms, the agency alleged. The CBI has also named a coaching centre owner, Shivraj Raghunath Mutgaonkar, as an accused. He got the question papers from Kulkarni through a middleman and circulated them among his students for financial consideration, the officials said.