This is last two year's i.e. JEE MAIN 2013 and 2014 Marks Rank Data. Here marks are total after including normalized JEE MAIN and Board Marks
JEE MAIN 2013
I expect the distribution this year also in line with this data.Its too difficult to actually predict because of such large and diverse sample size. So its best to gauge your performance on basis of this data.
All the Best!!