Hey aspirant,

As per your percentile mentioned your rank would come in a range of 573996 - 400110.

Firstly,as you haven't mentioned the exam about which you are asking but considering it to be jes mains then the answer would be-

That 40 percentile means that you would have scored a range of marks in 21-30.As you must be knowing the changes in evaluation of jee mains done by nta. For eg-the students who secured marks in a range of 21-30 they will secure 40 percentile.if you want to know more about it you can refer to the mentioned link below-

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

Also if you want to calculate your exact marks secured in jee mains then you can do it manually using the answer keys uploaded by nta on official website but only if you remember the number of questions you attempted along with yours answers. You can download the answer key using the link mentioned below-

https://jeemain.nta.nic.in/webinfo/public/home.aspx

And to have a list of colleges which you may get based on your rank you can use the link mentioned below-

https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer

Hope it helps.

Good luck.