Hey Divya,
There are four steps for the registration of JEE ADVANCED 2019.
And you have to complete all the four steps, skipping any of the step will lead to the incomplete registration.
So it's important to submit your certificates before examination.
For further information you can check link given below.

www.google.com/amp/s/engineering.careers360.com/articles/jee-advanced-application-form/amp

I hope this will help you out, for further query you can comment below.

All the best.

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