To take the best out of IIFT Delhi, first and foremost things is to attend all the classes and study hard, and second is to involve yourself in some kind of sports and cultural activities, there are too many sports competitions on Campus as well as in Delhi.
Every MBA college has so many clubs and committees like placements, sports, and cultural activities, so could be a part of one such committee, although the process to join them is pretty harsh, you can go for it. Lastly, you could explore Delhi and the places nearby, and make a good friend circle and connections.