For those who told you that CAT and GRE prep can go hand in hand:
1.They might be super geniuses so I salute them
2.They might be bluffing.
So in any case don't listen to them

I wanted to remain in my field (Computer Science),that's why I decide to go for MS.To learn more about my area of interest,to see things so I can go deeper into research type of stuff.MBA is for those who want to get into managerial positions.I can't understand why you haven't made up your mind yet

Well ,you can still decide but it's entirely upto what you want to make out of your life.Take some time off your preparation,talk to people,read articles and then decide.As I said,its your call

Feel free to ask anything but as previously stated,my replies may not be prompt.