There is a perfect procedure for getting a better rank in any competitive examination.
1.At first Complete your text books which are the basics and covers the syllabus totally not reference books .
Now if you have doubts clear them by asking teachers.
2.Now there are certain books for every competitive exams . Because every competitive exams have a pattern of questions.Now some people study those patterns and write those books.You have to grab one of this type of book and stick to it .Do not go through numerous reference books at a time.That would not only Sacre you but also kill your time.
Now study this book thoroughly.Solve each and every excercise from this book.And clear all of your doubts
3.Now get previous years questions of that exam.And solve it.This would give you the idea of the question pattern
4.Take your test.Mock tests are preferred.
And learn from mistake.
If you follow these you can get a better rank