my wife have completed 2 yr of bcom frm GNDU after that she has 3-4 year gap can she complete the the bcom final year ?frm any other colg?

Hi, You can approach the respective college if they can allow you her for continuing the course. Chances are less but if you have the relevant certificates of two years, then the college might allow. No other college will allow admission during mid-session. She might have to start from scratch.