mistak my form cast & course & married please solve me sir

Dear Vignan, the correction window to make changes to your GATE application form will open tentatively during the last week of October, You can change your Category  only from General/OBC Category to SC/ST or from SC/ST to General/OBC-NCL. It doesn't mention a provision of changing your Category from General to OBC-NCL or OBC-NCL to General Category. Please write to them at: thegatehelpline@gmail.com (mailto:thegatehelpline@gmail.com)