Hello Prachi, 
When i wrote JEE back in 2015, i used online resources to predict my rank, Colleges and other stuff.  I used lot of platforms for predicting my rank and few showed my rank within the bracket and few were very far.I was not patient. 
So i left predicting ranks and colleges and waited for my results  but when my results came i was surprised to see Carrers360 resources were accurate and near the actual mark. 
College and rank predictors are the hard work of last 10 year analysis. This year results may vary with less margin due to Percentile system as well as EWS category but that is not gonna vary for larger crowd and by larger margin..
Careers360 college predicting is used by lacs of students and always had positive results.It helps students to fill seat alloction choices without worrying alot. I would suggest you not to worry and be patient, your college will be very close to what predictor has shown you. You are not cheated, you need to be patient for the councelling.