MRCOG Part 1 vs Part 2: Key Differences and How to Prepare

The MRCOG examination is a two-part journey (three, if you count the OSCE). Part 1 and Part 2 are fundamentally different exams that test different things in different ways. Understanding these differences early in your career is essential for planning your study approach and managing expectations. This article compares the two exams side by side and gives you a clear picture of what each demands.

Format Comparison

Content Differences

Part 1: The Scientific Platform

Part 1 is fundamentally a basic sciences exam applied to obstetrics and gynaecology. You are tested on the science that underpins clinical practice, not clinical practice itself. The 15 knowledge areas fall under four domains: Cell Function, Human Structure, Measurement and Manipulation, and Illness.

What makes Part 1 difficult is not the depth of knowledge required. It is the breadth. You need to know anatomy, physiology, endocrinology, biochemistry, embryology, genetics, biophysics, statistics, pharmacology, immunology, microbiology, pathology, and clinical management. Most candidates have not actively studied many of these subjects since medical school.

The questions test understanding of mechanisms. Why does cardiac output increase in pregnancy? What is the embryological basis of a Mullerian duct anomaly? How does magnesium sulphate prevent eclamptic seizures at a cellular level? You cannot answer these questions from clinical experience alone. You need the underlying science.

Part 2: Clinical Application

Part 2 is a clinical exam. It tests your ability to apply knowledge to patient management. The syllabus is organised into 15 clinical modules that cover the full scope of O&G practice, including core obstetrics, maternal medicine, reproductive medicine, gynaecological oncology, urogynaecology, and early pregnancy.

The key difference is that Part 2 includes Extended Matching Questions (EMQs) alongside SBAs. EMQs present a theme and lead-in statement followed by 10-14 possible answers, with several clinical scenarios that each map to one of those answers. EMQs are harder to guess correctly because the answer pool is larger (10-14 options vs 5).

In Part 2, EMQs carry 60% of the marks in each paper and SBAs carry 40%. This means EMQs are disproportionately important to your final score.

The questions are scenario-based: "A 32-year-old woman presents at 28 weeks with sudden-onset painless vaginal bleeding. What is the most appropriate next step in management?" You need clinical judgement, knowledge of guidelines, and the ability to prioritise actions.

When to Sit Each Exam

The RCOG recommends sitting Part 1 early in your O&G training, ideally within the first 2 years. The basic sciences content is closest to what you learned in medical school, and the longer you wait, the more you forget.

Part 2 should typically be attempted after at least 2-3 years of clinical O&G experience. The clinical scenarios require practical knowledge that you can only gain from working in the specialty. Most candidates sit Part 2 during ST3-ST5 of their training.

You must pass Part 1 before you can sit Part 2. There is no minimum waiting period between passing Part 1 and sitting Part 2, so in theory you could sit them in consecutive sittings (Part 1 in January, Part 2 in March). In practice, most candidates take 6-12 months between them.

Study Approach for Part 1

Part 1 preparation is textbook-heavy. You need a primary source for each major knowledge area:

• Anatomy: A surgical anatomy text with clear diagrams. Learn to draw the pelvic floor, the blood supply of the uterus, and the layers of the anterior abdominal wall from memory.
• Physiology and Endocrinology: Focus on maternal adaptations to pregnancy, reproductive endocrinology, and fetal physiology. Understand mechanisms, not just facts.
• Statistics: Learn to read a 2x2 table, calculate sensitivity/specificity/PPV/NPV, and interpret common statistical tests. This is one of the easiest areas to score well in with focused study.
• Pathology: Know the WHO classifications for cervical, endometrial, and ovarian pathology. Gestational trophoblastic disease genetics is tested frequently.

Daily question practice with a question bank is essential. Aim for 20-30 questions per day from month 2 onwards. Use spaced repetition to retain what you have learned.

Study Approach for Part 2

Part 2 preparation is guideline-heavy. Your primary sources should be:

• RCOG Green-top Guidelines (GTGs): These are the gold standard. Know the major guidelines inside out, especially GTG 37a (VTE), GTG 52 (PPH), GTG 68 (Epilepsy in Pregnancy), and the others that cover common clinical scenarios.
• NICE Guidelines: CG190 (Intrapartum Care), NG121 (Induction of Labour), NG133 (Hypertension in Pregnancy), and NG126 (Ectopic Pregnancy) are frequently tested.
• TOG (The Obstetrician & Gynaecologist): RCOG's journal publishes clinical reviews that are often used as the basis for exam questions.
• Clinical experience: Your day-to-day work on labour ward, in antenatal clinic, and in gynaecology theatre is directly relevant. Pay attention to how consultants manage cases and why.

For EMQ practice, you need a dedicated EMQ question bank. EMQs require a different strategy to SBAs: you often need to match clinical vignettes to diagnoses from a long list, which demands pattern recognition rather than elimination of wrong options.

Common Mistakes

Part 1 Mistakes

• Ignoring low-yield topics entirely. Biophysics, Immunology, and Microbiology might only have 5-8 questions each, but that is 15-24 questions collectively. Ignoring them means giving away 10% of the exam.
• Studying only from past-paper reconstructions. They give a false sense of security, and the exam is not a memory test of previous sittings. Work from the guidelines the examiners write from.
• Not doing enough mock exams. You need to practice the stamina of sitting 100 questions in 2.5 hours. Time management is a skill that requires practice.

Part 2 Mistakes

• Neglecting EMQ practice. EMQs are 60% of the marks. If you only practise SBAs, you are underprepared for the majority of the exam.
• Not reading guidelines. Part 2 questions are often based directly on RCOG and NICE guidelines. If you have not read the guideline, you cannot answer the question.
• Relying on clinical experience alone. Clinical experience helps with Part 2, but guidelines may recommend different management than what you see on your unit. The exam tests guideline-based management, not local protocols.

Pass Rates and What They Mean

Part 1 has a pass rate of approximately 30-40%, making it one of the hardest postgraduate medical exams. This does not mean only the top 30-40% pass. It means 30-40% of candidates meet the absolute standard set by the Angoff method. If every candidate is well-prepared, more will pass; the pass rate reflects average preparation quality.

Part 2 has a higher pass rate of approximately 40-50%, partly because candidates are more experienced (they have already passed Part 1 and have more clinical years) and partly because the clinical content is more directly relevant to daily practice.

Neither exam should be taken lightly. The financial cost of resitting (£580-£635 per attempt), the time cost of additional months of study, and the career implications of delayed progression all make first-time passes highly desirable.

Planning Your MRCOG Journey

A reasonable timeline for the complete MRCOG journey:

• ST1-ST2: Sit Part 1. Six months of focused preparation. Pass it early and get it behind you.
• ST2-ST3: Build clinical experience. Start reading RCOG guidelines systematically. Begin Part 2 preparation informally.
• ST3-ST4: Sit Part 2. Six to nine months of focused preparation. Use your clinical experience to contextualise the guidelines.
• ST5+: Sit Part 3 (OSCE). This requires a different skill set: communication, clinical reasoning under observation, and professionalism.

The candidates who succeed treat each exam as a distinct challenge with its own strategy, its own resources, and its own timeline. Do not try to prepare for Part 1 and Part 2 simultaneously. The content overlap is smaller than you think.