Hey,

See it's very simple you register for any exam, and it's upto you whether you have to sit for the exam or not. The exam body don't ban you from sitting for the exam.

The same applies with All India Bar Examination. You filled the forma nd paid the fees for registration. Now it's your personal reason that you didn't sat for the exam. No you want to sit for the exam so technically you need to fill the exam form again along with the exam fee to be eligible to sit for the exam.

You can contact them also in order to  get more clarification regarding your doubt.

Official Website link: https://www.google.com/url?sa=t&source=web&rct=j&url=https://allindiabarexamination.com/&ved=2ahUKEwjxq42bt57vAhXmxjgGHS3jDZ0QFnoECBUQAg&usg=AOvVaw0NxOq9SpjmZGQBr0qu_IoS&cshid=1615128721572

Hope that helps.

Thank you