B.Sc

You can go for M.Sc agriculture as there is a very good scope in the same.

Hello Zaid,
Nautical Science is an undergraduate course approved by the Directorate General of Shipping, which falls under the Ministry of Shipping, Government of India.
The course is a study of the basic academic and practical devices required to safely navigate and operate marine vehicles, such as a ship. The subjects of study that form part of the courses curriculum are navigation and seamanship, which is the basic science of application of shipboard equipment and tools.

Hi,
The subjects your desired course includes are botany, urban forestry, forest insects & disease, land surveying, silviculture, forest vegetation and renewable wood products.
Forestry science courses teach about general knowledge, management principles and environmental concerns related to forest communities. You can also take individual classes if you personally like to.
Graduates of this program can work as professional foresters in any of the public and private industries. You also may apply for a research positions for government.

Please refer to the link mentioned below for a list of colleges which offer courses in B.Sc. in Gujarat. Fee structures for these colleges are mentioned. Additionally, you can also download the college brochure which contains important details like application dates, fee structures, placement information, entrance exams conducted for information, etc.
https://www.shiksha.com/science/colleges/b-sc-colleges-gujarat

If you have done your Diploma then you can go for B.Sc. I would suggest you to go for civil engineering.