IIT Kharagpur - Indian Institute of Technology

Hi Nazrana! Here is the link:
http://www.iitkgp.ac.in/phd
Visit this link.
Best of luck.

Yes,Eligibility to apply: Graduation (BTech) with 60%Additional Details: Candidates must have completed any one of the mandatory subjects or professional societies examination recognized by MHRD/UPSC/AICTE.Final year students can also apply on provisional basis.

Yes, GATE is a must for admission in IIT for post-graduation. Prepare for it and all the best.
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You should have a rank around 1500 so that you can securely get aerospace engineering. Also, alternatively you can take any of the branches being given to you now and then after 1st year can change the branch on the basis of your performance in 1st year because 1st year subjects are common for all.

It seems really difficult to me that you can get aeroscope engineering with the percentile you have got.

Eligibility criteria for M.Tech Naval Architecture is:
Bachelor's degree in Naval Architecture/ Marine Engineering/ Nautical Science/ Ship Building/ Mechanical Engineering/ Civil Engineering/ B.Arch or the equivalent.