Completely agree with Shashi..
Planning is the most important...And answering second group is very tricky for such subjects...
1. Costing- This is a paper which you want to get done with as early as possible. Most of the people backout of the exams or get demotivated due to this paper.
2.Taxation- You need to give ample time to this paper as the next attempt will present you with a new AY 10-11 so new stuff to learn again
3. IT & SM- This is a pretty scoring subject if you are good as computers and logic.Many people get exemption in this subject...
So overall..Make a time table and study with full dedication...
I know you will do it...Best of Luck!