what should be the criteria of passing units?

I have given IPCE both groups May'10

Pass in all,

clears second group,

But short in aggregate by 6 marks in first group,also i got exemption in A/c group 1,

Now, should i have to appear for remaining three subjects of group 1 i.e, costing,tax,law

and what will be the passing criteria then-

My marks are as follows in group 1-

A/c- 62, Law- 43, Cost-41, Tax- 48

Please guide me about the criteria of giving these 3 subjects.