MBA/PGDM

Heena, your query is not clear. Hope it is that you are interested undoing the above mentioned course.
PGDM and MBA are same, the only different is institutions affiliated to universities offer PGDM and universities offer MBA.
There are different ways of admission in MBA. Some institutes prefer CAT/XAT/ MAT scores only for admission to MBA course. And to appear for CAT/XAT/MAT etc student needs to have 50% in graduation. But eligibility criteria varies for various Management Institutes or Universities, they can take different %age in graduation along with CAT/ MAT/ XAT scores.
Another way of admission is internal tests or admission criteria of individual Management Institutes or Universities.
You can check the websites of universities like Amity, Lovely, Chitkara, Manipal etc for more details.
Good luck.

Shadab, both are equally good but then if you are inclined towards teaching or technical aspects you should go for M.Tech. Otherwise you should go for MBA as it will help you climb up the managerial ladder and go up in your career. Most of the top positions in companies are managerial and demand MBA.
In case you did not give GATE,CAT, MAT, etc, then you should try for admission in private universities like LPU, SMU, SRM, etc. Some of them will give you direct admission on the basis of your previous qualification and some on the basis of their own tests. Most private universities these days are at par with govt.ones and offer equally good facilities to students.
Some even offer scholarships.
Check their websites for more details.
Good luck.