Hello student you can calculate and get your rank easily by using this formula

100 -( your total percentile) 869010 /100

In your case your rank must be around - 43,450

Cut off vary every year on various factors like the level of question in the entrance examination and total number of applicants in that examination.

As per previous year records its expected that you need to secure rank around 5000 (EWS) I hello student

Last year the cut off for EWS category was 4591

For more updates refer to the link mentioned below - https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main-cutoff-for-iiit-pune/amp

Feel free to comment if you have any doubt

Good luck