HELLO ASPIRANT,

Sorry to say but you are not eligible for Merchant navy officer position with aggregate of 57% in class 12th and 44.33 % in PCM .

Eligibility criteria :- For Merchant navy you need to pass class 12th with PCM as mandatory subject and you need 60% marks minimum in 12th and some colleges may have higher requirements.

Non officer position:-if you are not eligible for officer positions you can still join the merchant navy for non officer positions these position may have different requirements .

IMU CET:- In addition to secure admission in IMU or other colleges you need to give IMU CET besides 12th marks .

Hope that Helps!