Day 1: Reach Guwahati : Go Kamakhaya Temple if you have time and start for Kaziranga National Park, around 5 hrs away from Guwahati.
Day 2: Do morning elephant safari and after lunch go for jeep safari
Day 3: Return back or go to Majuli and spend a day in Majuli.
Directly book a flight from Kolkata to jorhat.. from.jorhat its a 2 hours journey to kaziranga national park. u will reach in the same day.
next day went to jeep safari ,u cn stay at eco camp near kaziranga.. they are good.. spend the day . next day return to Kolkata or u cn explore more