Hi Shiva,
I assume you are talking about your JEE Main score in Paper 1. Given 78 marks, your probable rank will be 90,530 - 110,530 and your probable percentile will be 88.3 to 90.3.
You can also calculate your rank and percentile using the link given below:

https://engineering.careers360.com/jee-main-rank-predictor

Hope this helps : )