Hi Shiva!

While filling up the MAT application form, you have to choose 5 preferred B-schools, to which your application and MAT score will be sent by AIMA. Apart from those institutes, if you want to apply in other institutes, that you have to do separately by paying the stipulated application fee. For ATMA too, After the declaration of ATMA results, the shortlisted candidates need to check the ATMA 2019 counselling date. At the time of counselling, the students will be allotted seats in five different institutions he/she had chosen at the time of ATMA registration. The seats will beallotted to the candidates on the basis of the ATMA rank secured by them and the college cut-offs. 

All the best!