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 60917.

I'm so sorry to inform you but with this rank being an OBC category student its tough to get admission as we all know that seats are very limited and admission is directly based merit rank. IIIT HYDERABAD is one of the most prestigious iiit you need to score above 99 percentile to secure your seat easily in good branch at IIIT HYDERABAD.

If you want to appear in jee main April exam,you need to apply for it. Application for jee main April starts from 07th of February and shall remain open till 07th of March 2020.

For more updates on jee main refer the link mentioned below

https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main/amp

Feel free to comment if you have any doubt

Good luck