Hello,

In order to become a Marine Engineer, all you need is a minimum educational qualification of 10+2 with Physics, Chemistry and Mathematics as compulsory subjects. Even if you have completed a three year diploma in marine engineering, you can apply for UG course in marine engineering. Your age limit should be 17-25 years. The length of the graduate course of engineering may vary slightly in some countries, but in general it is 4 years, wherein the student undergoes comprehensive training in both theoretical as well as practical aspects of the science.

Hope this helps!