confused with optional level papers - need help

[awais002]

hi everybody i am acca professional module student.I am just confused which paper to select from optional level and still not able to make a decision. can anybody tell which paper to select from optional level paper p4,p5 and p7.my decision is to go for paper p4 and p7 but i have heard that p4 is tough paper. plz do reply and also explain the scope if i not select paper p4 and go for paper p5.
which paper is most important from practical point of view.i will be highly thankful to u

regards
awais