If you’re a 4th Engineer who’s cleared Class 4 or you’re already sailing as 2nd and eyeing Class 2, you’ll want to know: what’s the difference between Class 4 and Class 2 MEO exams? Both are DG Shipping competency exams for marine engineers (MOT/MEP), but the level and scope aren’t the same. This post explains how they differ and how your preparation should change — and how you can use the same platform (MeoMock) for MEO Class 4 and Class 2 orals and written practice.
Class 4 is the 4th Engineer (Class 4 Certificate of Competency). Class 2 is the 2nd Engineer (Class 2 CoC). The syllabus and the depth of questioning reflect the higher responsibility. So if you’re preparing for Class 2, you can’t just “do Class 4 again.” You need to go broader and deeper. And if you’re still on Class 4, it helps to know what’s ahead so you build a solid base.
Class 4 orals focus on the knowledge and application expected of a 4th Engineer: operation, maintenance, and safe procedures. The same four functions apply — 3 (Safety), 4B (Marine Engineering), 5 (Electrical), 6 (Maintenance & Repair) — but at a level appropriate to someone who’s been through sea time and the written exams for Class 4. You need to explain systems, answer “what would you do,” and show you understand regulations and safety. Pass mark is 10 or more points (about 60% competency as per MEO guidelines). Standard duration is typically around 20 minutes. Questions are often “what is,” “how does it work,” “what would you do if.”
Class 2 orals expect more. You’re being assessed for the level of a 2nd Engineer: deeper technical understanding, troubleshooting, management of maintenance, and decision-making. The syllabus builds on Class 4 and adds breadth and depth. You may get more “why” and “compare” and “how would you organise” type questions. The same functions apply, but the standard is higher. So your preparation has to cover the same areas in more depth and be ready for management and judgement questions, not just procedure. Check the latest DG Shipping syllabus and guidelines for Class 2 for exact scope.
Class 4 syllabus is the base. Class 2 syllabus typically extends it: more on management, planning, troubleshooting, and sometimes additional topics. So when you’re studying for Class 2:
Class 4: Cover the syllabus function-wise. Use a question bank and courses (Part A/B/C/D, Ship Construction). Do mock orals with the examiner set to Class 4 level. Focus on clear, correct answers and safety.
Class 2: Same structure, but go deeper. Revise Class 4 topics and add Class 2 syllabus. Use written exams and question bank at Class 2 level where available. Do mock orals at Class 2 level so the difficulty and style match. Expect more follow-ups and “explain your reasoning” type questions.
On MeoMock you can select exam level: MEO Class 4, MEO Class 2, or Chief Engineer. The AI examiner and question set adjust to the level. So you can use the same platform for both 4th and 2nd Engineer preparation — just switch the level and make sure your syllabus coverage matches.
Written exams (previous year papers) also differ by class. On MeoMock’s written exams you can filter by exam level (Class 4, Class 2, Class 1). The subjects and question style vary by level. Practising written answers at your target level helps you think in the right depth for orals.
The difference between Class 4 and Class 2 MEO exams is mainly scope and depth: Class 4 is 4th Engineer level; Class 2 is 2nd Engineer level with broader and deeper syllabus and higher expectation. Use the official DG Shipping syllabus for each. Prepare with function-wise coverage, question bank, and mock orals at the right level — and you can use the same preparation platform for both by switching the exam level to match your target.
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