If you have put the AILET 2021 Booklet number wrong then your exam sheet will get rejected. See the OMR's are checked in OMR machines. Now as AILET have multiple booklets which contains the shuffled question then your mistake can lead the machine that you have attempted another booklet and if that booklet exist then naturally your answer will be wrong or if your Booklet number don't exist then it will show error. As a result your exam will turn to be cancelled.

Sorry to inform you this.

I hope you have a plan B and you should work on that harder in order to be fulfil your dream. Best of luck!