I have scored 493 composite score in mat which colleges I can target?

Divyanshu, See ,to be honest, your score is quite average and your chances of getting the top B-Schools are extremely small irrespective of your category status and graduation credentials as the good B-schools usually demand a score of close to 650- 700 for selection. However, you may still get a call from these colleges and you may apply for them:

FORTUNE INSTITUTE OF INTERNATIONAL BUSINESS, DELHI

GURU NANAK INSTITUTE OF MANAGEMENT
STUDIES, MUMBAI

ALLIANCE UNIVERSITY, BANGALORE

JAIPURIA INSTITUTE OF MANAGEMENT, JAIPUR

IIHMR UNIVERSITY, JAIPUR

ITM BUSINESS SCHOOL, NAVI MUMBAI

ACCURATE INSTITUTE OF ADVANCED MANAGEMENT, GREATER NOIDA

ACCURATE INSTITUTE OF MANAGEMENT AND TECHNOLOGY, GREATER NOIDA

IFIM BUSINESS SCHOOL, BANGALORE

COIMBATORE INSTITUTE OF MANAGEMENT AND TECHNOLOGY, COIMBATORE

SRM BUSINESS SCHOOL, LUCKNOW

ANSAL UNIVERSITY, GURGAON

Also, you can apply for other management entrance exams too as a lot of colleges accept other scores than MAT too for admission.

If you want to know about all the colleges which you may get based on these scores, you can use this link

https://bschool.careers360.com/pathfinder/mat