FOR Kumar Mangalam Birla, who took over the reins of the Rs 15,000 crore Aditya Vikram Birla group of companies in 1996-97, it has been a year of baptism by fire. Under his stewardship, most of the AV Birla group companies have announced one of their worst performances in recent history. Flagship Grasim Industries has declared a 17 per cent drop in profit after tax, Hindalco Industries' net profit is down by 2.7 per cent while Indo-Gulf Fertilisers has announced a 25 per cent reduced net profit. The sole survivor is Indian Rayon Industries with an 18 per cent rise in net profit.