p3 approach to study and time needed

sir i am planning to write p3 in march sitting and i would like to know an approach and basic needs to secure a pass in the exam. i had given p2 and p1 in dec15 and only got p2 lost p1 with 47 marks ...so i have to re appear p1 in march ..... i am a full time student who is ready to commit lot of time for studies so can u give me some advice considering my situation.and time Regards Rijo