IELTS band score.....Do you know how it is distributed?

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I am sitting for IELTS exam on 6th of next month. But still i am not sure how it is distributed. There is no score range i found. Not even in internet. I only know that if you can achive 12 points on reading or listening then you get band score of 5. This is a score i don't want to know. I want to know the scores above this. There are around 40 questions & i need to know it all that how scores are distributed. So please if you know something then tell me. Also if you have any suggestions regarding IELTS then tell me.