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Hello Jai,
Well, there might be a slight confusion, because generally the new registration and the old will be a mix. Since u already have filled it last year because the authorities check if the student is reappearing or not. It is always advisable to fill the old.
Also there is for further details, you can even visit our website, where there is a detailed description of how to fill the JEE 2019 form
https://engineering.careers360.com/articles/how-to-fill-jee-main-application-form
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