Science is the subject where a child most often knows the answer and does not get the mark. The marks go to three different failures — not knowing the content, not writing it in the form the mark scheme wants, or not transferring a known idea to an unfamiliar setup — and they need different help. Diagnose which before choosing anyone.
Why science is unusual this way
In maths, a wrong answer usually means the maths went wrong. In science, a child can hold an essentially correct idea and still score nothing, because science marking rewards precision of expression as much as correctness of understanding.
A P5 student who writes “the plant grew better” when the mark scheme wants “the plant grew taller because it received more light” has understood the experiment and lost the mark. A Sec 3 student who says a reaction “goes faster when it’s hotter” instead of naming increased kinetic energy and collision frequency has the intuition and not the marks.
Parents read the report and conclude the child does not understand science. Frequently they understand it fine and cannot yet write it.
The three failures, and how to tell them apart
Content gap — the science is not known. The child cannot explain the phenomenon at all, in any words. Ask them to describe what happens when water evaporates, or why a circuit breaks, and there is nothing to work with.
This needs teaching. It is the most straightforward of the three and the least common at the point where families seek help.
Language gap — the science is known, the answer is not scoring. Ask the child to explain aloud and they get it broadly right. Look at the paper and the answer is vague, uses everyday words where technical ones are required, or omits the causal link the question asked for.
This is the most common and the most fixable. It needs exposure to mark schemes, practice at converting an understanding into the expected phrasing, and strict marking that takes the mark off when the phrasing is loose.
Application gap — the science is known, the scenario is unfamiliar. The child handles textbook questions and stalls when the same principle appears in a novel context — a data-response question about an experiment they have never seen, or a scenario combining two topics.
This needs variety of practice with feedback, not more explanation of the underlying content. The content is already there.
The at-home test
This takes fifteen minutes and is more diagnostic than any placement test.
Take a marked paper. Pick three questions where marks were lost. For each one:
- Ask the child to explain the answer aloud, without writing and without looking at the mark scheme.
- Then compare what they said to what they wrote.
If they cannot explain it aloud → content gap. If they explain it well but wrote something vague → language gap. If they explain the principle but say “I didn’t know that’s what it was asking” → application gap.
The three produce very different conversations, and you will know within minutes which one you are dealing with.
What to look for in teaching, per gap
For a content gap, look for teaching that builds the mechanism rather than the fact. A child who knows that evaporation is water becoming vapour has a fact. A child who can say where the energy comes from and why a breeze speeds it up has a mechanism, and mechanisms survive being asked sideways.
For a language gap, ask directly to see marked work. The question is whether marking comments on phrasing — whether it says “you needed to name the variable” rather than just crossing out. Ask whether students are shown mark schemes and taught to read them. Many are not, and it is one of the highest-return things in the subject.
For an application gap, ask how much of the practice is unfamiliar-context questions versus end-of-chapter questions. End-of-chapter questions cue the topic; exam questions do not. A student who has only ever practised with the topic announced will freeze when it is not.
Where the Singapore syllabus concentrates difficulty
Two points are worth knowing because they generate most of the demand for help.
Primary science asks for explanation earlier than parents expect. The PSLE format rewards structured causal answers — state the observation, name the cause, link them. Children who are strong at recall and weak at explanation start losing marks in P5, and it reads as a sudden decline.
Sec 3 splits into separate sciences and deepens fast. Pure chemistry and physics assume the Sec 1–2 foundation is secure and move quickly. A student who was coasting on general ability meets the point where general ability is not enough.
Neither is a reason to rush into tuition. Both are reasons to diagnose which of the three gaps you have, because at these two points all three become visible at once and it is easy to misread.
The language gap is more common than parents expect
Of the three failures, this is the one families are least likely to consider, because it does not look like a language problem — it looks like a science problem.
Science has its own vocabulary and its own sentence patterns. Words like transfer, relative, constant, proportional and significant carry precise meanings that differ from everyday use. A child reading them in the everyday sense understands the question incorrectly and answers accordingly.
Questions are densely worded. A single sentence often carries the scenario, the variable being changed, and the thing being asked. A child who reads slowly loses the thread before reaching the question mark.
Answers must be written in that same register. A child who understands the science and writes it in ordinary language frequently scores below what they know, because the terms carrying the marks are absent.
How to tell: ask the child to explain the question back to you in their own words before answering it. A child who cannot restate what is being asked has a reading problem, not a science problem — and more science teaching will not touch it.
What helps: reading the question aloud, underlining the actual ask, and building the specific vocabulary as vocabulary. For a child whose difficulty is here, general reading practice helps over months and question-decoding practice helps this term.
Where the free fix usually is
Before buying anything, three things are worth doing because they cost nothing and frequently resolve the presenting problem.
Get the marked paper and sort it. Not the grade — the actual lost marks, sorted into did-not-know, misread-the-question, and knew-but-wrote-it-loosely. Ten minutes with a paper tells you more than any diagnostic a provider will run, and it decides which of the three failures you are dealing with.
Ask the school teacher one specific question. Not “how is he doing” but “where is he losing marks?” Science teachers see the same errors across a whole class and can usually name the pattern precisely.
Then use the school’s own provision. Remedial and consultation slots are free, taught by someone who knows the exact paper format, and consistently under-used because families do not ask. For a child whose gap is technique rather than content, this is frequently sufficient on its own.
Buying teaching before doing these three things is how families end up paying for content coverage when the actual problem was that their child never read the question properly.
Frequently asked questions
My child understands science but keeps failing. Why? Almost always the language gap — the understanding is real and the written answer is not collecting marks. Compare what they say aloud to what they wrote; the difference is the diagnosis.
Does science tuition need to be subject-specific at secondary level? Increasingly, yes. A tutor teaching chemistry weekly knows the mark-scheme conventions of chemistry. General science tutoring works at primary and lower secondary; from Sec 3, specialism matters more.
Is practical work important for exam marks? Understanding experimental design is, because data-response and planning questions test it — variables, controls, reliability. A child can lose steady marks on this without ever having a content gap.
How much of the improvement is just practice? For the language and application gaps, a great deal — but only practice that is marked. Unmarked practice rehearses the same imprecise phrasing.
Group or one-to-one? The language gap responds well to group teaching, because seeing several answers marked is instructive. The content gap benefits from one-to-one, because it needs pace control.
—