Well there are two best ways to get into merchant navy in India,

1- one year Diploma in nautical science
2- three year BSc degree in nautical science.

then you have to clear IMU (Indian maritime university) CET exams. 
if you will search on on IMU website you will get the information regarding the admission process and dates of entrance.

Hi Ishaan.

Great that you wish to be a cadet officer in merchant navy.Merchant Navy, as the name suggests is the term is the term for commercial marine services.The commercial naval activities in India include shipping of cargo and people across various destination of the world.If you love to travel then it is a great job for you as you'll be travelling around the world for the completion of your task.

To join merchant navy you have to appear Indian Maritime University examination which is known as IMU CET.The IMU CET is conducted around 1st week of June.There are many other colleges for which can be considered which include :

1)Tolani Maritime University

2)International Maritime Institute

3)B.P.Maritime University.

4)TMS Chanakya

5)NMA Chennai

The last two colleges accept JEE scores as well.All the colleges accept IMU CET scores.Tolani conducts its own examination.You can appear for AIMNET as well.

Attaching some links for your detailed knowledge

1)http://aimnet.net.in/

2)https://university.careers360.com/articles/merchant-navy

Merchant Navy, as the name suggests is the term is the term for commercial marine services.The commercial naval activities in India include shipping of cargo and people across various destination of the world.If you love to travel then it is a great job for you as you'll be traveling around the world for the completion of your task.

To join merchant navy you have to appear Indian Maritime University examination which is known as IMU CET.The IMU CET is conducted around 1st week of June.There are many other colleges for which can be considered which include :

1)Tolani Maritime University

2)International Maritime Institute

3)B.P.Maritime University.

4)TMS Chanakya

5)NMA Chennai

The last two colleges accept JEE scores as well.All the colleges accept IMU CET scores.Tolani conducts its own examination.You can appear for AIMNET as well.

Attaching some links for your detailed knowledge

1)http://aimnet.net.in/

2)https://university.careers360.com/articles/merchant-navy

Dear Ira,

Firstly for merchant navy you need to give CET this may 2018.
Then, coming to your query, fees vary from institute to institute. As Government institutes will be cheaper than private ones.
Government institutions will charge near about 2-2.5 lakhs per annum. Whereas in private institutions it will be 4-4.5 annum per lakhs.
The fee structure include hostel, tuition, food and some stationary.
I hope this helps.
If you like the answer, kindly up vote!
Good luck.

• Candidates aspiring to appear for IMU CET 2018 can fill the application online
• The commencement of online application form for IMU CET 2018 will be from 1st week of April 2018 shall end in 2nd week of May.
• Candidates are required to upload the followingScanned PhotographSignature10th Marksheet & Category certificate if any for (SC/ST/OBC candidates only)
• Candidates are required to download and print filled-in application form in a standard format for their reference.After successfully submitting the application form a system generated e-mails/SMS will be sent to the candidates.

• Age Limit Minimum age 17 years (Students appearing for Class 12th Exams can also apply)
• Maximum age 25 years on or before 1st August 2018
• Age Relaxation: 5 years for reserved category candidatesMarital Status: Unmarried / Single

• Qualifying Exam: Candidates have to pass 10+2/ equivalent examination orB.Scor BE/B.Tech (from IIT or college recognized by AICTE).
• Subjects: Candidates have to pass 10+2/ equivalent examination with PCM or B. Sc. in PCM, Electronics with Physics as individual subject in one of the years.
• Minimum Marks: Minimum 60% marks (10+2/ equivalent examination) or not less than 50% marks (B.Sc& BE/B.Tech)

• Before applying for IMU CET exam, all candidates are required to apply fo a passport before taking admission.
• Medical fitness certificate by Doctors approved by Director General of Shipping is required for candidates want wish to apply to apply for marine courses.
• Candidates appearing for their final exam can also apply but they have to qualify their examination on or before 31st May 2018.

• Here are the importantDates for IMU CET 2018 Exams

• 4-Year B.Tech (Marine Engineering)
• 4-Year B.Tech (Naval Architecture & Ocean Engineering)
• 3-YearB.Sc(Maritime Science)
• 3-YearB.Sc(Nautical Science)
• 3-YearB.Sc(Ship Building & Repair)
• 3-Year BBA (Logistics, Retailing & E-Commerce)
• 1-Year Diploma in Nautical Science leading toB.Sc. (Applied Nautical Science)

• 2-Year MBA (Port and Shipping Management)
• 2-Year MBA (International Transportation and Logistics Management)
• 2-YearM.Sc(Commercial Shipping & Logistics)
• 2-Year M.Tech (Naval Architecture and Ocean Engineering)
• 2-Year M.Tech (Dredging and Harbour Engineering)
• 2-Year M.Tech (Marine Technology & Management)