i) prepare for the pre-exams and also complete the syllabus of any one of the selective subject.
iii) If you complete mains then start preparing for interview.
iv) For interview you must have good English skills so start preparing as soon as possible since you can't prepare English in one day.
v) You should have good general knowledge. For this you must read newspapers and magazines.
vi) You must choose those optional subjects which you like to obtain maximum marks.