PMHOW CAN I PASS WITH 50... Cant understand F5 much...PLEASE HELP?

Can someone please help me with regards to what i need to know to just be able to pass this paper f5 as i am having a terrible headache trying to understand this… I have done f1 to f4 and f6 its okay but f5 i am stuck still… Is there any tips or way or a method for studying this? For example the way i studies all f1 to f4 and f6 was to use the open tuition as well as the passcards from BPP and do my own study notes. I am unfortunately, working full time and i dont have that much of time left but i know in a month, god willing, i can pass this….. Please anyone with any experience please help me out. I wish you all the best as well and we all must help each another…. We have come so far and we have a little more to go x Bless you Regards, Alex