Hello,
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Yes,you are allowed to correct to your application form on or before date.
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Once the form is submitted there will be given special dates for correction of the form.On or before the date gets completed you can edit your application form.
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Availability of application form correction facility dates aren't out till now.
Correction of marks,category,gender is last week of October to 1st week of November.
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You need to login in official website and make your changes.Here you will be costed for changes you are doing.
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For any more details like procedure to follow for changing etc please follow below provided link,
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https://engineering.careers360.com/articles/gate-application-form-correction

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