From my experiences, I say focus more on G12 than G11. Malet I know G11 have some hard topics that should be focused on, but G12 is very bulky and you can't finish it in a hurry. You can watch YouTube videos or just do exercises from extreme for G11 and you can still get good grades, but G12, you can't escape it just by watching YouTube videos...you need to dig deep. In fact G11 books give general informations and relatively are easier than G12 books. If you want to watch YouTube videos: "Organic chemistry tutor" https://youtube.com/c/TheOrganicChemistryTutor This person is by far the best online tutor on YouTube You'll nail this test don't worry😊