CA final - Old Grp 2

Hi,

I have just 1 grp of CA final-old  (Grp2) left. But have not been able to clear it for the past so many attempts.I refer to padukas for costing , Shekhar for DT, Bangar for IDT . i really dont know what mistake i am comitting while studying as i have not been able to clear them.Pls guide me as to how to sudy this grp as i dont find much time also since i have a small daughter to look after.Pls guide.