Focus @ ISB

Since the time I have comeback from the alums meet. My mind is working overtime as to how I can make best use of my time at ISB. As per the alums you need to be exteremely focussed and committed to achive what you have set out to achieve.
I have decided to focus on non-IT consultancy post ISB as first option. 2nd option is marketing.
Why I need to have second option is , because I donot consider myself too good at studies, you need good grades to get into consultancy, and also I am not from IIT's so i need to have a backup option.
I am now looking at gaps in my resume that I need to fill by making special efforts at ISB, to get me what I want post-ISB.
Another thing I am worried about is getting used to 4hrs of sleep for the next 1yr. I have never felt good with less than 8 hrs of sleep , I dont know how I will manage. Even if I manage I will need to train myself to be mentally alert. Let's see.
After the Alums meet I have stopped worrying about Funds for ISB education. It seems it is responsibility of ISB once you apply for it.... so I am a little more relaxed on that fornt.