Hello Subham , You can register for MAT entrance test by going through the official website of ALL INDIA MANAGEMENT ASSOCIALTION.

Go through the below mentioned link

https://www.aima.in

Go to this link , then click on MAT

Then go to the Quick links

Few highlighted box will appear , one of us says Online registration for B-School for May 2018 MAT .

Click on that a page will open .

Scroll down , you will see Online registration form .

Fill it up and submit it .

Best of luck !!!