A genuine comprehension gap shows up across explanations, examples and practice. A teaching-style mismatch shows up when your child can engage with the idea in one format but repeatedly loses the thread in the way it is currently presented.
In London in 1854, physician John Snow faced a cholera outbreak near Broad Street. The cause of cholera was still contested. Snow did not begin by assuming every household had the same problem or by prescribing the same remedy. He mapped deaths, compared water sources and followed exceptions, including people who lived nearby but had not become ill. His investigation helped persuade local officials to remove the handle from the Broad Street pump.
Snow’s account, On the Mode of Communication of Cholera (1855), matters here because he separated a visible result from its cause. A child’s low mark, unfinished homework or reluctance to attend a lesson is a result. Before adding more tuition, a parent needs to see what is creating it.
Look for the pattern, not one difficult evening
A comprehension gap usually travels with the subject. Your child may struggle to explain a concept in their own words, choose the wrong method even after seeing an example, or make the same error in classwork, homework and a timed task.
For a Cambridge IGCSE Mathematics student, that might mean they cannot reliably turn a word problem into an equation, even when the numbers and wording change. For an IB Diploma student, it may mean they can identify a theme in a text but cannot support an interpretation with evidence. The gap needs teaching and practice because the underlying knowledge or method is still unsteady.
A teaching-style mismatch has a different shape. Your child may understand during a short conversation, after drawing a diagram, or when working through one example slowly, then become lost in a fast lecture, a dense worksheet or a lesson that moves on before they can test their understanding.
Ask for specific examples from school and from home. “She finds science hard” is too broad to act on. “She can describe the process aloud but cannot follow the written steps independently” gives you something to investigate.
Use three small checks before changing the plan
You do not need to turn the kitchen table into an assessment centre. Over a few study sessions, try three simple checks with one topic that has caused trouble.
- Ask your child to explain the idea aloud, using their own example.
- Give one familiar question and one slightly changed question, then notice where the work breaks down.
- Change the format: use a diagram, a worked example, a short video from their school resource, or a conversation before returning to written practice.
Keep the aim modest. You are gathering clues, as Snow did, rather than trying to prove a verdict in one sitting.
If your child cannot explain the idea and cannot apply it when the format changes, a comprehension gap is likely. If they can explain it after a visual or verbal route but stall when faced with a particular lesson format, pacing or instruction style may be getting in the way.
Timed work can blur the picture. A student may understand a topic but lose marks because they read too quickly, freeze under a clock, or spend too long on one question. A Parent’s Timed-Test Clue. Find the Error Before the Clock Runs Down explores how to notice that distinction before treating every lost mark as a knowledge problem.
Give the tutor a useful starting point
The first tutoring conversation works better when it begins with a pattern rather than a label. Share the curriculum, current topic, recent school feedback, examples of work and the times when your child seems most able to concentrate. Mention learning support needs if they are relevant to how lessons should be planned.
For example: “He understands ionic bonding when he talks it through, but his written answers leave out key terms” is more useful than “He is weak at chemistry.” It points towards a lesson that checks subject knowledge, teaches answer structure and lets the student practise both.
Curriculum fit matters here. Cambridge, IB and US pathways can ask students to demonstrate understanding in different ways. A tutor who knows the programme can look at the actual demand of the task, then decide whether the student needs subject teaching, a different route into the material, more deliberate practice, or a combination. What Happens When the Same Cambridge Grade Hides Different Support Needs? explains why the same grade can conceal very different next steps.
Review the evidence after a few lessons
A good plan should create new evidence. After a few lessons, look for a change you can describe: clearer explanations, fewer repeated errors, greater independence on an unfamiliar question, or less time spent getting started.
If a student understands more but still avoids the subject, examine workload, lesson timing and confidence as well. If they enjoy the lessons but the same core errors remain, the teaching plan may need more direct work on foundational knowledge. The answer can change as the evidence changes.
That is the practical lesson from Broad Street. Snow did not treat proximity to the outbreak as a full explanation. Parents do not need to treat a difficult subject as a full explanation either. Bring examples, test the pattern and choose support around what the student actually needs to learn next.
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