Hello,

Which exam are you enquiring about, see once candidates submit application form successfully then unless it's specified by the authority no changes can be made, like in last two years only because of the pandemic, the changes regarding this were allowed, this was exception case which normally don't occur, however such decisions are usually taken keeping in mind the convenience of candidates appearing for the exam, I would request you to elaborate on your query as in for which exam are you enquiring, else you can also search our site for any other relevant information regarding this.