Hello Aspirant,

If you have not completed the application process of GATE the you will not be able to get the admit card.

If after completion still you don't receive then,

Don't worry,  you will receive your card before the specified date. If not, use your form number to check the status of your application with the relevant authorities. If your application was accepted but you haven't received your admit card by the deadline, get in touch with the authorities through their official channels. Get the required information or the status of your form by contacting your zonal office and visiting there with your speed post slip and a Xerox copy of your application form.

ALL THE BEST