Despite poor projections in exit polls, why is BJP confident in Delhi?

Voting for Delhi Assembly elections ended on 8 February and the fate of all the candidates have been sealed in the EVMs. Almost every exit poll has projected a landslide win for the AAP. But BJP still seems confident and their state president Manoj Tiwari has even claimed that the party will win 48 seats. What is the reason behind this unwavering confidence?