Hello,
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Colleges accepting MAT score;

• Shri dharmasthala Manjunateshwara Institute, Mysore
• University of petroleum  energy studies, Dehradun
• Christ university, Bangalore
• VIT business school, Vellore
• National institute of technology, Warangal
• Doon business school, Dehradun
• New Delhi Institute of management, Delhi
• ITM business school, Navi Mumbai

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Follow the link for more colleges
https://bschool.careers360.com/colleges/list-of-mba-colleges-in-india-accepting-mat

Colleges accepting CMAT;

• Institute of management technology, Ghaziabad
• IIHMR University, Jaipur
• Great lakes Institute of management, Chennai
• Institute of public enterprise, Hyderabad
• Amrita school of business, Coimbatore
• Japuria Institute of management, Chennai
• KL University school, Guntur
• MUST school of business, Pune

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Follow the below link for more college details
https://bschool.careers360.com/articles/top-b-schools-accepting-cmat-scores
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Coming to ROI, return on investment is a least facility offered by any college. Few reputated Colleges offer, reimbursement system where most of the colleges have scholarship facility. So, can't decide a college based of ROI

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