Eligibility to join Merchant Navy companies in foreign countries

I want to join Merchant Navy Company in UK so please tell me its eligibility criteria?

[Quick Sam]

To join Merchant Navy Company in UK you have to fulfill these entry requirements

Nautical Science or Marine Engineering
Entry requirements:
GCSE Grades A-C/Scottish Standard grades at Levels 1-3 in English, Maths, a Science based subject and at least one other subject.

Marine Operations / Nautical Science / Marine Engineering / Marine Electrical Systems
Entry requirements:
120 UCAS points in unspecified A Levels or Scottish Highers Plus GCSE / Scottish Standard Grades in the above subjects at levels A or B /Scottish credit level.

BSc (Hons) Merchant Ship Operations or Nautical Science, BEng (Hons) Marine Engineering Applications, or Mechanical & Marine Engineering
Entry requirements:
Entry is in accordance with the requirements of sponsoring companies and the admission requirements of the universities concerned and will usually require Maths and/or a Science A Level or Scottish Higher.