Raghunath in order to upload your all certificates you need to follow the steps given below:

• Go to the official website https://www.jeeadv.ac.in/
• You will be able to see a link to candidate login portal. Click on it and a new window will pop up where you will need to enter all your credentials
• You will need to enter your registration number (starting with K which you must have got while registering for JEE Advance examination), your Date of birth, your registered mobile number and your email id
• In case if you have forgotten your registration number then also don't worry as you will find an option for the forgotten registration number and you can fetch it through your mobile number and email id
• Then after login to your portal, you will see an option to upload the certificates. On clicking it a new window will open with options to upload 10th marksheet, 12th marksheet and category certificate
• You will need to click on the "upload document" tab and then upload the scanned copy of your certificate. Make sure you keep in mind the size of your file. It should be in the range of the size mentioned below each tab

The last date to upload all the documents is 5th June 2018.

Feel free to ask if you have any more queries. All the best!!