The exam scoring system changed slightly in 2010 so since then, the overall marks have comprised of two elements; Maths/NVR and English skills, with the 'average' being about 100 each.
This is why the consortium have said that parents will receive the past two years' 'last scores in' data as part of their letter.
If you look at the years before that, the scores are a third higher (it was a 3-way system of Maths/NVR/English and therefore cannot be compared
If you look at the last candidate pass scores in the sticky I have added an extra line in parentheses giving the average standardised score for each section or paper so you can see the trend.
As um says - multiply by 2 for the last 2 years and 3 for years before that to get the actual required min score.
I doubt they will give a rank, probably far to complicated for the KE grammars and consortium school - for girls you could have a rank of 700+ and still get in - but less for boys