Plss..help me..how to pass this P4 paper?

I am really tired of this paper.Do you know how to pass it?.Do we have to do a lot of practice on NPV,APV and WACC in expense of foreign exchange n currency risk.In exam,i tried to take average mark of all question and attempt all question.My friend has attempted question 1 and 2 really good in expense of question 3 and 4(not completed),but he managed to pass it.Do examiner look at the understanding the core of the paper such as NPV,APV and WACC more than foreign,currency exchange?..Somebody pliss give some relevant comment about this..