As you have asked about the admit card for the recruitment of Constable (CT)/ Telecom (PET/ PST), I am giving you information about it, check below for the details

I want to tell you that the process for this exam has been already over.
There is no admit card available now for it.
However, you can check for its website to know about the next notification for it.
To check it, you can follow steps given below
Go to ITBP website
Place Cursor on Recruitment
Click on Advertisement, the page open look like



Here you will get the information about the notification when available.

Here I found following:

ITB Police is hiring Ex-ITBP and Ex-Army Instructors in various subJ.Willing persons may contact DIG(Trg) at the following address DIG(Training)Dte General, ITB Police, Block No.-2, CGO Complex,Lodhi Road, NDelhi – 3. Exchange No. – 011-24360773, 24362837,– Ext-339
Advertisement for the post of AC(Engr.) in ITBP to be field by direct rectt.
Adv. for two posts of Joint Assistant Comdt (Account Officer) JAC(AO)in ITBP
Adv. for 6 posts of Chief Vet Officer and 8 posts of Senior Vet officer in ITBP
Advertisement for Walk-in -Interview for GDMOS& Specialists Doctors for ITBP
Appl are invited fm serving male/female SI/Insp (GD) for post of AC(GD) in CAPFs
Scheduled for WALK-IN-INTERVIEW for Appmt.of SPL. Doctors in contractual basis