I have completed 12 class . Am I eligible To Join Merchant Navy ?

Yes definitely after completing 12 you are eligible To Join Merchant Navy.

Indian Maritime University conducts CET to take aspirants for different courses.

Courses or Programs offered by IMU
Naval Architecture & Ocean Engineering- Bachelor of Technology -4 years
B Tech Marine Engineering 4 year program.
B Sc Ship Building and Repair - 3years
B.Sc Nautical Science
B.Sc Maritime Science

Eligibility Criteria
Aspirants should have passed or appearing the final examination of the 10+2 system,organised by any recognized central/state Board or equivalent with Physics, Chemistry and Mathematics as compulsory subjects
Candidates must possess good binocular vision
The age of the Applicants should not be more than 25 years (for General) and 30 years (for SC/ST) as on 01st August 2014

IMU CET Exam Dates:
Date of Submission: 20th May 2014
IMU CET 2014 Exam Date : 14th June, 2014
IMU CET 2014 Result Date : 18th June, 2014