Hi, paper change will only be done after successful payment of the fees. There is an extra 500 rupees charge for change of paper. It is available near submit option for editing. But, the date of making changes was November 18, 2021. Below is the link to an article that might help. Hope this helps.
https://engineering.careers360.com/articles/gate-application-form-correction
Eligibility | Application | Exam Pattern | Admit Card | Preparation Tips | Books | Question Paper | Accepting Colleges
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile