Hey Xtreme,
I can see that you're in pretty deep trouble if you only know a small part of the syllabus, I would recommend you get a professional home tutor to help you study the rest of the syllabus. It also wouldn't be a bad idea to focus your studying on the most important parts of the book, which are chapters: 3, 4, 7, 9, 10, 11, 12, 14, 15, 16, 17. It won't be easy, and you will have to put in as much effort as possible to improve your grade. I think dedicating 2 hours a day for Geography would help you achieve at least a C.
Good luck Xtreme,
and wish you the best.
Matt
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PS. You're gonna get screwed, so, 5OTH!!!