MAT May 2019 Registration process starts in the first week of March and will continue till the last week of April 2019. And from 1st May MAT 2019 and till the second week of May for computer based May MAT 2019 and phase-2 paper based May MAT 2019 exam.  

Hi Balaji, the mat registration for the may exams have been opened already on March 7,2019 itself. The last date for registration for MAT paper based test is on April 27,2019 and the last date for the registration for Computer based test is on May 12,2019. The registration fee for single test is 1550/- and it is 2650/- for both the exams. Please refer to the below link, for the oline registration 

https://mat.aima.in/feb19/