Thank you sirBut sir u are right that RANK vs MARKS scale is increased this year but last year student get 176 marks got AIR 10000(approx.) how my rank quite low this year. I thought I'll get around 20000 rank but it's very low beyond expectations, why..? 

That is the reason dear. Last year, students didn't got chance to rectify their mistake and score well as there was only 1 attempt. This year two attempts were there which made things easy. Also those students who are having a tie in Percentile are given rank based upon their score in Maths, Physics and Chemistry. If your score in Maths is high then your rank will be good as compared to the person having similar percentile.
Hope it made things clear!

Yup all clear Thank you sir But still I'm dissappointed with the percentile system. As I'm a dropper student I was in need of a good rank.

I know you are shocked by the result. Stay determined and perform well in whatever college you get. You will definitely get success.

All the best for your career ahead.

Thank you so much sir..