I have completed class 12th via distance mode through NIOS. Am I eligible for IMU CET?

Yes, however, Students who have completed through the boards which are classified as Fake Board by the Ministry of Human Resources are ineligible to appear for Common Entrance Test for admission to Indian Maritime University. As you know NIOS is a recognised board So the candidates who qualify from

Yes, with NIOS exams you are eligible for IMUCET but there is very less chance that companies will select you in sponsorship test, as state board, CBSE and ICSE board Students are preferred more.