You can simple check your JEE main rank by visting the official website of JEE Main or click on the link given https://jeemain.nic.in/jeemainresult/root/authcandwithdob.aspx

Enter simple details like application number and date of birth from your Admit card and check your JEE Main rank.

You can check jee main Mark's through the website jeemains.nic.in . You will be needing your enrolment number that will be available on your admit card. Also you can find out your rank through other websites who helps in releasing result as soon as they are out. But I would suggest going by the official website