Hello Pratyusha. Thanks for contacting Careers360 and we hope we will be able to answer your query.

As regarding your query, that section in the TS ICET application form called: "last qualifying exam admit card number" is basically the hall ticket number of the last exam taken or appearing in.

So, if you are in B. Tech, just write the hall ticket number or your college registration number or something like that in that column. 

I would like to direct your attention to this link for more information:

• https://exams.collegedunia.com/tsicet/application-process

Hope this helps you and all the best!