You have good chances for Rajiv Gandhi National University of Law with rank under 800. To know more accurately you can use CLAT college predictor. This tool helps the students to predict the right colleges with courses where he/she can get admission and also helps them in preparing for counselling. The chances are getting predicted based on historical data. Not only simply relying on cut-offs, many statistical algorithms are developed to maintain maximum accuracy in predicting the admission chances. To know more click the link below -

http://www.law.careers360.com/clat-college-predictor