Hi, there

Hope you are doing well

If your 12th marks are currently above 75%, then you should fill in the percentage of your original 12th board result when registering for JEE. Once your improvement results are out, you can update the information during the correction window or submit the updated marks during the admission process.

If not then unfortunately you have to wait for your result to fill the form.

hope this will help you

Best wishes for you.