Hi Vishwa,

If you have drop after 12th then it will consider gap between your education which may affect your placements or for IPMAT but if you have valid reason for that gap then they will consider it. for that you have to convience them with proper reason and what you did during that time. Also there are some companies which accept gap for placement. Don't worry perform well after that gap so that they consider your request. 

All the best!!