Jaipur

Manipal University, Jaipur is relatively a new institution, but still it's doing really well as the placements were really remarkable this year. Manipal has got its brand name and value in the corporate sector, so in the coming year it's going to be in the top colleges of India. So, Manipal is a good option and you will have lots of opportunities over there, as it is a new institute.
I hope that I have answered your question.

Dear Rohit
Check the British council institute for English training programme through that you will get the right knowledge and environment too .
All the best

if u want to join Amity u cn go with Amity Noida

AKG is the best among your three choices for BTech Mechanical Engineering.

In my opinion, MSRIT is by far the best among the above in terms of job placements and project opportunities. However, a great deal depends on your choice of branch.

You should go through institutions website and visit FAQ I.e frequently asked questions to clear many doubts. You can also approach the aluminum or students of that institute by finding them in social networking site.