P4 must take lei.. very interesting one and some more all those things u studied in P4 are relevant anytime, anywhere.. screw P7.. i hate to deal with standards..

I don't think it will be difficult to cope with your audit job if you didn't take P7 cause' you will start from the bottom, learning everything all over again. P7 is related to more advanced audit procedures, you most probably don't get to use it during your early years as an auditor.

I took P4 because I feel its very relevant to our everyday life. We have to invest in our money sooner or later, might as well learn it now, better than learning it through failure, losing more money in the process.

P4 involves quite a lot of analysis since you need to know what the question wants before you choose either NPV, APV, etc...
Some questions can be very twisting and are not very obvious. But half of it is also theory, so if you are good in theory, you might pass without doing the deep calculations.