Unfortunately, in JEE Mains, if you changed your answer in the last moment and didn't save it before submitting the paper, your original answer will be considered for evaluation . Here's why:

• The answer sheet captures your responses in real-time: As you mark your answers on the computer screen, your choices are instantly recorded on the answer sheet.
• There's no "saving" mechanism: Unlike some online forms where you have to hit a "submit" button, JEE Mains answer sheets are automatically updated with your latest response whenever you select an option.
• No chance for revision after submission: Once you submit the paper, there's no way to go back and change your answers.