If you want to pursue your naval architecture from a good college, I would suggest you that you should look after gaining admission in top IITs for the same. As of now, Indian Institute of Technology, Madras and Indian Institute of Technology, Kharagpur offer B.Tech and other masters courses in Ocean Engineering and Naval Architecture. I have included the cut offs for the same below:

IIT Kharagpur (Ocean Engineering and Naval Architecture GEN 2021):

Opening Rank: 5663

Closing Rank: 7243

IIT Madras (Ocean Engineering and Naval Architecture GEN 2021):

Opening Rank: 5512

Closing Rank: 7238

Hope I have answered your question. All the best!