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You must prepare for it extremely methodically, be very determined, and remember that passing any exam does not imply that you are knowledgeable about the related subject. Now that you have the basics down, you can start studying for the exam. For example, in organic Chemistry you should begin by reading Clayden and Warren's book and learning about GOC, PI molecular orbitals for benzene, annulene, and various conjugated PI systems, stereochemistry, and various types of reactions and their mechanisms. Next, you should read about retrosynthesis, photochemistry, carbohydrate, amino acids, and spectroscopy (NMR, IR, UV-visible)
When studying inorganic Chemistry you should first learn about acids and bases, Redox Reactions and chemical bonds. After you have correctly mastered these concepts, you should move on to learning about electronegativity, atomic radius, electron affinity, ionisation potential, organometallics, and bio inorganic Chemistry. For physical Chemistry you now begin with numerical constants, various curve types, molarity, normality, and molality. Next, you move on to Chemical Equilibrium gaseous state, ionic equilibrium, phase diagrams (up to three component systems), Thermodynamics electrochemistry, quantum mechanics, spectroscopy, and the adsorption isotherm. You must practise for prior year papers in addition to learning the fundamentals.