Hi Radha,

This means the hall ticket number of the exam for which you last appeared for. For example if you are filling a form for a college to puruse your graduation degree from there and they ask for qualifying hall ticket number then they are asking your 10+2 admit card number because at that time that number would be your qualifying exam hall ticket number.

Hi Radha

The hall ticket number is the unique number which is printed on your admit card. It helps in allocating your seat during the examination and is of much greater importance hence and thereafter.

Hope it helps :)