General ACCAHelp me!!!

I attended f4 and f5 class from jan until april. And, for f4 I already registered for the exam. But for f5, I’m not sure whether to take june or September exam because I don’t even know what am i studying this past few months. I got exemptions for f2 so basically I cannot catch up some of the chapter in f5. But i feel like I’m wasting my time if I don’t take f5 exam this coming June. What should i do? Do you think one month is enough to cover all in f5? And fyi i also full time working. I can only spend time around three hours x 5 weekdays and 14 hours weekend. Help me.