Samundra Institute of Maritime Studies

It will be tough but if you have luck in your side, then who knows. If not, then there are several private colleges and universities. Yes, they are much expensive also. And another thing you can do is first do diploma, then B.Sc. Make the best choice.
All the best.

Go through the link below for admission details :
https://www.shiksha.com/engineering/course/graduate-marine-engineering-gme-samundra-institute-of-maritime-studies-sims-lonavala-lonavla-pune-29337
(copy paste the entire link on the browser )

Yes, on the basis of your rank in IMT, you can get admission in AEMS and SIMS, but not in IMU.

Minimum marks should be atleast 60% in PCM.

No, you need to score a minimum of 60% in PCM.

No, you need to score a minimum of 70% in PCM.

No special book, just the syllabus of class XII (PCM).

Please check for your eligibility to pursue B.Tech in Marine Engineering from Samundra Institute of Maritime Studies from the criteria mentioned at the link provided below:
https://www.shiksha.com/b-tech/course/b-tech-in-marine-engineering-samundra-institute-of-maritime-studies-lonavla-pune-24627