The first day is called Day 1 (and not 0) at IITD. The most elite and sought after companies come on Day 1, and their packages are obviously highest among the visiting companies.
There are the Consulting companies including Mckinsey, B.C.G., Bain, Parthenon, A.T. Kearney in the morning slot, and Diamond, Opera, Essex in the evening slot. Their packages are 15-16 Lakhs, with the exception of Parthenon, which gives 29 lpa.
There are Finance companies like GoldmanSachs, WorldQuant, Deutsche Bank, etc. They offer a bit higher packages.
There are core companies including Schlumberger, GSK, ITC, HUL. They offer packages in the range of 16-20 lpa. Schlum offers 34 lpa.
Then there is a big chunk of Computer Science companies, like Google USA and Indian, Samsung Korea and India, Microsoft USA and India, Facebook USA, Tower Research, Code Nation, Nutanics, Visa, IBM, DirectI, etc. etc. All of them offer packages over 20 Lakhs
On Day 2, there are slightly smaller consults and majorly analytics companies. Companies requiring people for various management roles like Flipkart, Housing, Snapdeal, etc. start appearing Day 2 onwards and come till Day 4-5.