Dear aspirant,

To recover your first year hall ticket number, you should start by checking old documents like previous results or application forms. If you can't find it there, then visit the official website where your results are posted and look for a forgot password or retrieve hall ticket option. You may need to provide details like your name, date of birth, or email address to recover it. If these options don't work, then it will be best to contact your school's administration or the relevant examination authority.

Hope it helps!