Top Tips to Get an A* in IGCSE Combined Science

Success in IGCSE Combined Science is within reach with the right approach. This guide shares strategies for the Single Award (0653), Double Award (0654 Cambridge Co-ordinated Sciences or Edexcel 4SD0), and other variations, showing you how to use the syllabus, past papers, notes, and tuition effectively to aim for an A* or grade 9. You may find more details in The Ultimate IGCSE Combined Science Study Guide.

Introduction

Combined Science can feel challenging because it requires you to balance Biology, Chemistry, and Physics in one course. It’s less in-depth than taking three separate sciences, but it still covers a wide range of topics that need attention. On top of that, the exam format has its own structure depending on whether you’re taking Cambridge, Edexcel, Core, or Extended.

This article will guide you through the essentials: the exam format, the most important topics to revise, effective study methods, and what makes the difference between a good grade and a top grade. If you want to advance to the next grade level, the advice here will guide you through the process step by step.

Understand the IGCSE Combined Science Exam Format

To achieve top marks, you first need a clear understanding of how the IGCSE Combined Science exam is structured and assessed. While Cambridge uses an A* to G scale for grading the course, Edexcel uses the UK’s newer 9 to 1 grading scale.

What Is the IGCSE Combined Science Exam?

IGCSE Combined Science combines Biology, Chemistry, and Physics into a single qualification. Depending on your school, you might be sitting the Single Award (worth one IGCSE) or the Double Award (worth two IGCSEs).

The Cambridge IGCSE Combined Science (0653) is the Single Award. It covers a selection of topics across the three sciences and awards one grade. The Cambridge IGCSE Co-ordinated Sciences (0654) is the Double Award. It offers deeper coverage, with two separate grades at the end. The Edexcel IGCSE Combined Science (4SD0) is also a Double Award but assessed differently.

Understanding which syllabus you’re following and what tier (Core or Extended) you’re entered for is the first step to planning your revision.

Exam Papers Overview

Each exam board tests knowledge, understanding, and application across Biology, Chemistry, and Physics. While the formats differ slightly, the main principles remain the same. You’ll need to show both subject knowledge and the ability to apply it in problem-solving and practical contexts.

For Cambridge, the exam is divided by tier:

• Core tier candidates sit multiple-choice (Paper 1), structured questions (Paper 3), and a practical paper (Paper 5 or 6).
  
• Extended tier candidates sit multiple-choice (Paper 2), structured questions (Paper 4), and the same practical paper.

For Edexcel, all students sit the same level. They complete two broad science papers, each lasting two hours, which cover Biology, Chemistry, and Physics together. Practical skills are assessed within the written questions rather than through a separate practical paper.

This structure ensures all students are tested on theory, application, and practical understanding, regardless of the exam board. 

Master Key Topics for Each Science Subject

To get the best marks, you need to know which areas examiners focus on most. Here are the topics that deserve extra attention.

Top Biology Topics to Focus On

Biology includes many detailed processes and definitions, so concentrating on what’s commonly tested can make your study sessions more effective. Key areas include:

1. Cell biology: structure, function, and transport mechanisms such as diffusion and active transport.
   
2. Enzymes and biological molecules: how they work, their importance, and experiments linked to them.
   
3. Human body systems: including respiration, circulation, digestion, and nervous coordination.
   
4. Reproduction and genetics: mitosis, meiosis, inheritance patterns, and variation.
   
5. Ecology and ecosystems: food chains, energy transfer, and human impacts on the environment.
   
6. Plant biology: photosynthesis, transport, and adaptations.
   
7. Diseases and immunity: including the immune response and the role of vaccines.

Chemistry Topics That Are Crucial for Success

Chemistry often requires both memory and maths, making it essential to be confident with calculations. You may focus on:

1. Atomic structure and bonding: periodic table trends, ionic and covalent bonding.
   
2. Chemical reactions: balancing equations, acids and bases, salts, redox reactions.
   
3. Stoichiometry and mole calculations: expect these in structured papers.
   
4. Metals and reactivity: extraction methods, reactivity series, corrosion.
   
5. Organic chemistry: alkanes, alkenes, alcohols, and their reactions.
   
6. Energetics: exothermic and endothermic reactions, energy level diagrams.
   
7. Rates of reaction: factors affecting reaction rate and how to measure them.

Physics: Key Concepts to Revise

Physics is often the trickiest for students, but it’s also where clear understanding can really boost marks. You need to concentrate on:

1. Forces and motion: Newton’s laws, interpreting velocity–time graphs, and calculating acceleration.
   
2. Energy transfers: efficiency, conservation of energy, formulas for work done, and power.
   
3. Waves: the behaviour of light and sound, including reflection and refraction.
   
4. Electricity and magnetism: circuit diagrams, current, voltage, resistance, and the basics of electromagnetism.
   
5. Thermal physics: heat transfer methods (conduction, convection, radiation) and the particle model of matter.
   
6. Radioactivity: half-life calculations, safety measures, and writing nuclear equations.

By focusing your revision on these essential areas, you’ll strengthen your understanding and maximise your chances of scoring an A* or grade 9.

Effective Study Techniques for A* Preparation

You’ll need a mix of organisation, active learning, and practice. Here are the methods that work best.

Create a Study Schedule and Stick to It

Plan your revision across weeks and months rather than cramming at the end. A clear schedule helps you stay organised and reduces stress as exams get closer. Breaking your work into smaller, regular sessions is far more effective than last-minute studying.

A realistic plan should include:

• Covering all three sciences evenly so no subject is left behind.
• Allocating extra time to your weaker areas to build confidence.
• Leaving at least two weeks before the exam for full past papers under timed conditions.

Use Active Recall and Spaced Repetition

Passive reading doesn’t work well because it gives the illusion of learning without actually strengthening memory. Instead, use methods that actively challenge your brain:

1. Flashcards for definitions and formulas.
2. Spaced repetition apps to revisit topics regularly.
3. Self-quizzing to test what you know rather than just reviewing notes.

Practice Past Papers and Mark Schemes

Working through IGCSE Combined Science past papers is one of the most effective ways to strengthen both your knowledge and exam skills. They show you how questions are asked, highlight common pitfalls, and train you to use precise wording that examiners want to see. 

Follow this simple routine to get the most out of your practice:

• Attempt papers without looking at notes.
• Mark your work with official mark schemes.
• Rewrite incorrect answers using the correct wording.
• Gradually practise under timed conditions.

Focus on Weak Areas Using Targeted Revision

Avoid spending too much time on topics you already know well. Write down mistakes from past papers and tests to spot your weak areas. Then use your IGCSE Combined Science notes and textbook to review and improve those gaps.

These strategies give you a clear framework for revision, helping you turn hard work into the grades you’re aiming for.

What Sets Students Apart in IGCSE Combined Science?

The difference between a good grade and a top grade in IGCSE Combined Science often comes down to how well students apply their knowledge and handle exam questions.

Mastery of Core Concepts and their Application

High-achieving students don’t just memorise facts. They understand how to apply them. For example, instead of simply recalling the definition of osmosis, they can explain it in the context of a practical investigation or data table.

The ability to connect concepts across Biology, Chemistry, and Physics also matters. For instance, energy transfers link directly between Chemistry (exothermic reactions), Biology (respiration), and Physics (conservation of energy).

Exam Technique: How to Tackle Each Type of Question

Examiners look for clarity and precision. To score highly:

1. Use the correct scientific terms, as vague language loses marks.
2. Pay attention to command words such as “explain,” “evaluate,” or “calculate.”
3. Show all working for calculations.
4. In structured questions, answer in full sentences, not bullet points.
5. Practise interpreting graphs and diagrams, which are common in all three sciences.

With a balance of solid understanding and strong exam skills, you can rise above common mistakes and achieve the very best grades.

Need Extra Help? How a Tutor Can Support Your Journey to A*

Sometimes independent revision isn’t enough, especially if you’re aiming for the top grades. IGCSE Combined Science tuition with a qualified teacher or examiner can make a huge difference. An effective tutor can explain tricky concepts in simpler terms, provide targeted feedback on past paper answers, help with time management and exam technique, and keep you motivated and accountable.

If you’re moving from Core to Extended or aiming for an A*, professional guidance can give you the edge. TutorsPlus offers certified teachers and examiners who specialise in Cambridge IGCSE Combined Science and Edexcel courses, giving you expert support tailored to your exam board.

FAQ

How do I improve my grade from 6 to 9 in Combined Science?
The key is exam technique and mastering Extended content. Use past papers to refine how you answer questions. Focus on common mistakes highlighted in examiner reports.

What’s the best way to revise for IGCSE Combined Science in the last month before exams?
Prioritise timed past papers. Review your mistakes carefully and revisit weak topics. Use summary sheets and glossaries for quick recall.

How many hours should I study each week to get an A?
Most students benefit from 3 to 5 hours of practice outside of lessons, increasing to 6 to 8 hours as exams approach.

Is Combined Science harder than Triple Science?
It covers less content per subject but still demands focus because you’re learning three sciences at once. The pace can feel intense, but it’s manageable with good organisation.

Final Thoughts

Getting an A* in IGCSE Combined Science relies on three essentials: knowing the syllabus, practising past papers, and mastering exam technique. With steady revision and a clear plan, you can build confidence and effectively tackle both Core and Extended content.

For additional support, please contact us at +41 22 731 8148 or to book a free trial with a certified tutor. Our teachers and examiners provide tailored strategies and feedback to help you reach your best possible grade.

By Sara Lloyd

Sara has been an education consultant for TutorsPlus for 15 years, and is an expert on international education.  She is also a parent of two lively children.