Colleges in Madurai

Generally, both are same. Since institutions like TSM, PSG are autonomous, they can easily update their MBA syllabus too without much problems. Hence, it depends upon you, whether you are looking for a degree or diploma. Regarding TSM, I think there might be a slight advantage if you go with their PGDM since it is recognized as equivalent to MBA by AIU and preference will be given to PGDM as it is their flagship programme. Fee is also high for PGDM, while when it comes to placement both MBA and PGDM average is around Rs 5 lakh. So, it depends on you. Nowadays, it is better to choose marketing as one of your specialization.

Yes, your MAT score is valid.
MAT September score eligibility may change in 2017.But mostly it will be above 650.0

No ,MBA requires minimum percentage of 50%.