To Start with the preparation of exam , you need to have a firm determination and zeal to achieve goal and the most importantly the capability to work hard to overcome from your own weaknesses
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You must give special emphasis on physics and chemistry Besides Biology In Biology try to solve as many as question given in standard text Book like Biochemistry by Lehninger, Immunology by Kuby, Tools and technique by Wilson and walker
Always take references of last year question papers to analyze your studies and the coaching you are taking.
Give equal emphasis on all units of the prescribed syllabus. In chemistry you must prepare well the areas like coordinate chemistry, spectroscopy aromatic chemistry and Reaction mechanisms
In Physics always give emphasis on tricky question (But not lengthy) of the following topics in Detail, Like optics, electro statistics, Mechanics Kinetic Theory of gases , Thermodynamics