Dear Harish, 

NTA, the examination conducting body of CMAT, is yet to release the admit card of CMAT. It was scheduled to be released today, i.e. January 7, 2019, however, it hasn't been released till now. You can track the same at the url of CMAT admit card given below. The link to access the admit card will be made available here as soon as it is made available on the official website. 

W.R.T. the last date to download the admit card, in all likelihood, it will remain available for download till the exam date, i.e. January 28, 2019. So you do not need to panic. Furthermore, I suggest you to not wait until the last date to download the admit card, read the instructions and keep it safe (in hard copy and soft copy) for future use. 

CMAT Admit CARD: https://bschool.careers360.com/articles/cmat-admit-card

Hope it helps.

Good Luck!