help needed in costing and F.M.

hi,  iam a PCC student attempting the ongoing exams. although i have applied for both groups , have studied only the first group but iam still going to attempt the group 2 exams too ..... even though iam not counting on anything in 2nd group , could you guys give me some advice on some last minute prep for costing and FM so that i go there and atleast give a valid effort in the exam !! anything like imp chapters etc. ( i have the latest edition of padhuka ) or imp topics and few topics to ignore in the last minute study

any advice will be well appreciated....thanks

sid