One-to-one tuition almost always costs more than group tuition, sometimes considerably more, so the real question a parent is asking is not "does it work," it is "is it worth paying the premium for." That is a fair, practical question, and it deserves an answer grounded in evidence rather than a list of generic benefits that applies to any form of extra teaching.
The Education Endowment Foundation (EEF), the UK's leading authority on what actually improves attainment, has reviewed the evidence on both one-to-one and small-group tuition in detail. Its findings are more specific, and more useful for an actual spending decision, than "personalised attention works."
The EEF's Teaching and Learning Toolkit rates one-to-one tuition as delivering an average of five additional months of progress, at moderate cost, based on a review of 123 studies. Small-group tuition, typically in groups of two to five pupils, delivers an average of four additional months of progress, at low cost, based on 62 studies.
That one-month gap is real, but it is not the headline. The EEF's own guidance states plainly that small-group tuition "may be a sensible approach to trial before considering one-to-one tuition," precisely because it delivers most of the benefit at a fraction of the cost. For a family weighing up value rather than simply buying the most expensive option available, that is the single most useful sentence in the entire evidence base.
Here is the detail that generic tutoring-benefits content almost always leaves out: the EEF's impact figures are not the same across subjects or age groups. One-to-one tuition shows a substantially stronger effect for literacy, around six additional months, than for mathematics, where the average is closer to two additional months. It also shows a stronger effect in primary school, around six months, than in secondary, around four months.
This matters directly for a maths-focused decision. If the subject in question is GCSE or A-Level Maths specifically, the evidence for one-to-one's advantage over well-run small-group teaching is considerably thinner than the headline five-month figure suggests. That does not mean one-to-one maths tuition does not work; it means the size of the premium you are paying for should be judged against a smaller expected gain than the marketing framing usually implies.
The EEF's evidence also points to something that has nothing to do with group size at all: how the sessions are structured. The strongest results come from short, regular sessions, around 30 minutes, three to five times a week, delivered over a focused period of up to ten weeks, closely linked to what the child is already being taught in school. A single long weekly session, whatever the group size, is a weaker format than several short, frequent, curriculum-linked ones.
In practice, this means the format question a parent should be asking is not only "one-to-one or group," but "how often, how long, and how closely tied to my child's actual school curriculum." A well-structured small-group programme with the right dosage can outperform an infrequent one-to-one arrangement, evidence-wise.
Taken together, the honest reading of the evidence is: small-group tuition is the evidence-backed starting point for most families on cost-effectiveness grounds, and one-to-one earns its premium in specific situations, most clearly for literacy-focused support, for younger children, or for a narrow, well-defined gap (a specific exam technique weakness, or catching up after an absence) where individual, closely tailored attention outweighs the cost difference.
This is also, in practice, how Merit Tutors' own KS2 Maths tuition and KS1 Maths tuition are structured: small classes of around five to six pupils rather than large groups, with personalised resources addressing individual gaps inside that small-group format. It sits close to the evidence-backed middle ground rather than either extreme. For GCSE and A-Level students with a more specific, individual need, our separate guide on one-to-one tuition for GCSE and A-Level success sets out when the one-to-one premium is the right call at that stage.
Is one-to-one tuition always better than group tuition?
Not according to the evidence. The EEF's toolkit shows one-to-one delivers around five additional months of progress on average against four months for small-group tuition, a modest gap, and small-group tuition costs considerably less. The EEF specifically recommends trialling small-group tuition first on cost-effectiveness grounds.
Does one-to-one tuition work as well for maths as it does for English?
The evidence suggests not to the same degree. One-to-one tuition shows a stronger average effect for literacy, around six months of additional progress, than for mathematics, around two months, meaning the case for paying a one-to-one premium is generally stronger for reading and writing support than for maths.
How often should tuition sessions happen to be effective?
The EEF's evidence points to short, regular sessions, around 30 minutes, three to five times a week, over a focused block of up to ten weeks, as the format most closely linked with strong results, regardless of whether the sessions are one-to-one or small-group.
Is small-group tuition a lesser option than one-to-one?
No. The EEF explicitly frames small-group tuition as a sensible, evidence-backed first step because of its stronger cost-effectiveness, not as a compromise. One-to-one earns its higher cost in specific situations rather than being categorically superior.
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Updated 18-September-2026
