i need to take admission in B.Sc nautical science but my marks are extremely less so what and how should i do ? Please help me out !!

Visit http://www.ima-maritime.com/EligibilityLink.htm. Eligibility : Pass in HSC / (10+2) From a Recognized Broad With 60% Average Physics, Chemistry, Mathematics & 50% Average in English Subject either in 10th or 12th Standard. I presume you have that

If your marks are less (1) but above required eligibility, then you can plan management quota dmission, if possible (2) if below eligibility then you can plan some other course.