I hav just perursued my b.tech via mechanical engg.i want to plan for my masters so pls suggest me which one is best with best package

If u score good in the gate then it will be your choice either u can join good company or else you can go for further studies in some good institute.

You need to write GRE and English language tests like TOFEL. Based on the scores you can apply for Masters programs. It is not mandatory to have work experience. The acceptance completely depends on how well you prepare your package. Check the tutorial given at http://beyond.insofe.edu.in/category