In my experience, the students who lose the most marks on the practical paper are rarely the ones who misunderstand the chemistry. They are the ones who carry out the experiment competently, then write up a results table with no units in the headings, record a temperature to a different number of decimal places from the rest of the column, or describe a colour change as a conclusion. The chemistry was right. The writing was not. This article looks at where those marks disappear and what a student can do about it before exam day.
Where the marks really go
The IGCSE Chemistry practical assessment, whether it is the practical test or the alternative-to-practical written paper depending on the route your child is following, rewards a few habits far more than it rewards cleverness at the bench. Examiners are looking for accurate recording, sensible planning, clear reasoning about what the data show, and an honest evaluation of how the method could be improved. Each of these can be trained, and each can be lost through carelessness.
A useful starting point is to ask, for every practical your child has done this year, which of these four skills was tested and how many marks were available for it. Most students discover that they have been practising the first skill and neglecting the other three.
Observations are not inferences
This is the distinction that costs the most marks, and it is worth dwelling on. An observation is what you can see, smell, hear or feel: a precipitate forms, the solution turns from pale green to yellow, the test tube becomes warm. An inference is an interpretation of that observation: a reaction has taken place, a gas has been produced, an ion is probably present. Students often write inferences in the observation column because they already know the answer from class.
Train the habit deliberately. When your child completes a test, ask them to say aloud only what they saw, then ask separately what that suggests. Write the two in different columns from the start. It feels slow for the first few practices, but by the time of the exam it has become automatic.
Recording results the way examiners expect
Accurate recording is largely a matter of consistency. A few points that examiners return to again and again:
- Give every column a heading with its quantity and unit, for example time / s or volume / cm³.
- Record readings to the same precision as the measuring instrument allows, and keep that precision consistent down the column.
- Repeat readings where the method calls for them, and make sure any averages are calculated correctly.
- Draw tables in pencil with a ruler, and make sure every row is labelled.
None of this is glamorous, but it is where a careful student can gain several marks with no extra chemistry knowledge at all.
Planning, variables and evaluation
Planning questions ask students to decide what to change, what to keep the same and what to measure. The common error is to name a variable without explaining how it will be controlled. Saying the temperature will be kept the same is not enough; the student needs to say how, for example by using a water bath and checking with a thermometer before each run.
Evaluation is the other area where good students lose ground. Rather than writing that the experiment was fine, they should identify a specific source of error, explain its effect on the result, and suggest a realistic improvement. A balance that reads to one decimal place, a stopwatch started a moment late, or a solution that was not fully mixed are all concrete points that earn credit when they are explained properly.
How INACADEMICS builds practical confidence
At INACADEMICS, practical preparation is tied directly to the published assessment criteria. Sessions use IGCSE mark schemes and past papers, so students learn what examiners actually reward, not what sounds impressive. Our chemistry specialists, who are trained in the Cambridge framework, will often ask a student to justify a row of results or to rewrite an evaluation until it names a specific error and its effect. That kind of precise feedback is hard to give in a crowded classroom.
Our batches are kept small, usually between four and eight students, so each learner's recording habits can be seen and corrected. Every student starts with a short diagnostic and a per-subject plan, so we know whether the gap is in observations, planning or evaluation before any time is spent on practice. Weekly worksheets and monthly mocks then show whether the gap is closing, and we send parents regular updates tracked against that plan, so you can see progress rather than guessing at it.
Frequently Asked Questions
My child knows the reactions well but still loses marks in the practical. Why?
Knowing the chemistry is only part of the practical assessment. Marks are also given for accurate recording, careful planning and a clear evaluation. Many students who understand the content have simply not practised writing observations separately from inferences, or presenting results with units and consistent precision. We work on these specific habits from the first session.
How much practice is enough before the exam?
It depends on your child's starting point, which is why we begin with a diagnostic rather than a fixed number of sessions. Regular short practices, with feedback on the writing as well as the bench work, usually do more than occasional long ones. Our monthly mocks help us judge when a student is ready and where the remaining gaps lie.
Do you only teach the practical skills, or the full IGCSE Chemistry course?
Our IGCSE teaching covers the whole course, and practical technique is woven through it. Students who understand why a method is designed the way it is tend to plan and evaluate far better, so the theory and the practical reinforce each other.
How will I know how my child is getting on?
You will receive regular parent updates tracked against the plan we agree at the start. They show which skills are improving, which need more work, and what we are doing about it, so you are never left wondering.
A calm place to start
Mastering the practical paper comes down to steady, specific habits: separating observations from inferences, recording with care, and evaluating with precision. Your child does not need to become a different chemist to score better. They need to practise the skills that examiners actually mark. If you would like to see how this would work for your child, you are welcome to contact us for free counselling on +91 9014010410 via phone or WhatsApp, or to visit our centre at 117, 1st Floor, Raichandani Business Bay, above Karachi Bakery, Kokapet. We will start with a short diagnostic and build a plan from there.