When parents start looking for a tutor, the default assumption is usually one-to-one. One child, one teacher, full attention. It feels like the obvious choice.
But the evidence tells a more nuanced story. In primary schools specifically, small-group tuition delivers results remarkably close to one-to-one - and in some subjects, it can actually be more effective. When you factor in the cost difference, the case for group tutoring becomes hard to ignore.
This article breaks down what the research actually shows, explains when each format works best, and helps you decide which approach makes sense for your child.
What the research says: the numbers that matter
The most authoritative evidence on tutoring effectiveness in the UK comes from the Education Endowment Foundation (EEF), an independent charity that evaluates educational interventions using rigorous methods - including randomised controlled trials, the gold standard in educational research.
Their findings on the two formats are striking in how close they are:
One-to-one tuition delivers an average of five months' additional progress per year across all age groups. In primary schools, the impact is higher - around six months' additional progress. In secondary schools, it's around four months.
Small group tuition (defined as one teacher working with two to five pupils) delivers an average of four months' additional progress per year. In primary schools, the impact is also four months. In secondary schools, it drops to around two months.
The gap in primary schools is roughly two months of additional progress - meaningful, but considerably smaller than most parents expect. And in certain subjects, the gap narrows further or disappears entirely. In reading, the EEF found that small-group tuition can sometimes be more effective than one-to-one or paired tuition, possibly because group discussion deepens comprehension in ways that individual instruction cannot.
There's an important qualifier: group size matters. The EEF's evidence is clear that once group size exceeds six or seven pupils, effectiveness drops noticeably. The sweet spot appears to be groups of two to five, where the tutor can still provide individualised attention while the group dynamic adds its own benefits.
Why group tutoring works: the mechanisms
If one-to-one gives your child 100% of the teacher's attention, why would sharing that attention with other children produce nearly the same results?
The answer lies in how children actually learn, which turns out to be more complex than simple attention allocation.
Peer learning is real. When children work alongside peers at a similar level, they learn from each other - not just from the teacher. Hearing another child explain their thinking, seeing a peer make and correct a mistake, or working through a problem collaboratively all reinforce understanding in ways that one-to-one instruction alone cannot replicate. The EEF's Teaching and Learning Toolkit rates peer tutoring at five months' additional progress - one of the highest-impact strategies they've studied.
Group dynamics reduce anxiety. One of the consistent findings from the EEF's research is that group tutoring reduces the stigma sometimes associated with being tutored. Children who feel self-conscious about receiving extra help - who worry that being pulled out for one-to-one signals that they're "behind" - often feel more comfortable in a group setting where they can see they're not alone. For children with maths anxiety in particular, this normalisation can be powerful.
Research from the University of Cambridge found that more than three-quarters of children with high maths anxiety are actually normal to high achievers on curriculum tests. Their anxiety isn't about ability - it's about the emotional experience of doing maths. A supportive small-group environment, where mistakes are normalised and children encourage each other, can address this emotional dimension in ways that one-to-one tuition may not.
Explaining strengthens understanding. In a well-structured small group, children don't just receive instruction - they articulate their own thinking. A child who explains to the group how they solved a problem is consolidating their understanding more deeply than if they'd simply answered a question from a tutor. This is sometimes called the "protege effect" - teaching strengthens the teacher's own learning.
Wait time improves. In one-to-one tuition, the tutor's attention is constant. While this sounds entirely positive, it can actually reduce the thinking time children need to process new concepts. In a small group, while the tutor works with one child, others have a moment to think, try, and sometimes self-correct - which builds independence and metacognition (thinking about thinking).
When one-to-one is the better choice
Group tutoring isn't always the right answer. There are specific circumstances where one-to-one tuition is genuinely worth the additional investment:
Severe learning gaps. If your child is significantly behind their peers - not a year group's difference, but a fundamental gap in foundational skills - one-to-one allows the tutor to go back to basics without worrying about the pace of a group. A child who hasn't grasped place value, for instance, needs targeted individual work before they can benefit from group instruction on more advanced topics.
Specific learning difficulties. Children with diagnosed dyscalculia, dyslexia, or other specific learning difficulties often need highly individualised teaching approaches that can't easily be delivered in a group setting. A specialist tutor working one-to-one can adapt their methods in real time to the child's specific needs.
Extreme anxiety or shyness. While group tutoring reduces stigma for most children, a small minority find any group setting overwhelming. If your child's anxiety is so severe that they can't participate or concentrate when other children are present, one-to-one may be necessary - at least initially - to build confidence before transitioning to a group.
Entrance exam preparation. The 11-plus and other selective entrance exams often require highly specific, strategic preparation that's best delivered one-to-one. The tutor needs to assess the child's precise strengths and weaknesses against a specific exam format and tailor every session accordingly.
For the vast majority of primary school children, though - children who need support with curriculum maths, English reading, GPS, SATs preparation, or times tables fluency - group tuition delivers excellent outcomes at a fraction of the cost.
The cost equation: this is where it gets decisive
The effectiveness gap between one-to-one and group tutoring is modest. The cost gap is enormous.
Here are the real numbers for primary-level tutoring in the UK in 2026:
One-to-one with a qualified teacher: £35-£60 per hour. For weekly sessions over a 10-month academic year, that's roughly £1,400-£2,400. For the twice-weekly sessions that the evidence suggests are most effective, double it.
One-to-one with an unqualified tutor or university student: £15-£30 per hour. Cheaper, but you lose the curriculum expertise, QTS, and child development knowledge that qualified teachers bring. The EEF's evidence is clear that programmes using experienced, specifically trained teachers produce larger effects than those using volunteers or untrained tutors.
Small group tuition (2-5 children) through a platform or agency: £10-£20 per child per session. Better, but still adds up over an academic year.
Bell.Study group lessons: £5 per session. Live, online, taught by qualified primary teachers with QTS and enhanced DBS checks, in groups of two to five.
At Bell.Study's price point, a family can afford three sessions per week for the same cost as a single one-to-one hour with a qualified teacher. Over a term, that's 36 sessions versus one. Over an academic year, it's approximately 120 sessions versus 40 - three times the tuition at the same total cost.
The EEF's own analysis of the Tutor Trust programme - which delivered small-group tuition to Year 6 pupils in groups of three - found that the total cost per pupil was £112 for 12 hours of tuition. Children in the programme made three months' additional progress in maths. The EEF designated it a "Promising Programme" and noted that the approach may be particularly beneficial for children eligible for free school meals and those with lower prior attainment.
The cost-effectiveness calculation isn't close. Per month of additional progress per pound spent, small-group tuition dramatically outperforms one-to-one.
What makes group tutoring work (and what makes it fail)
Not all group tuition is equal. The EEF's evidence highlights several factors that separate effective group tutoring from ineffective:
Teacher quality matters most. The variability in findings across different group tuition studies suggests that the quality of teaching may be as important as - or more important than - the precise group size. A brilliant teacher with a group of four will deliver better outcomes than a mediocre tutor one-to-one. This is why Bell.Study exclusively uses qualified primary teachers with QTS, not university students or unqualified tutors.
Groups must be carefully composed. The strongest evidence for group tuition comes from studies where children were grouped by similar ability level and similar learning needs. A group where all children are working on the same foundational concept - say, fractions, or inference in reading - allows the teacher to target instruction precisely. A randomly assembled group where one child needs times tables practice and another needs help with algebra will be less effective.
Diagnostic assessment upfront is essential. The EEF recommends that diagnostic assessment should be used to identify which children need support and what specific gaps to target. This means that before a child joins a group lesson, there should be some understanding of where they are and what they need - not just a generic "Year 5 maths" session.
Sessions must connect to school learning. Tutoring is most effective when it's linked to what the child is learning in the classroom. Ofsted's independent review of tutoring found that the most effective schools ensured close communication between class teachers and tutors, so that tutoring sessions reinforced and extended classroom learning rather than running in parallel.
Group size should stay below six. The evidence is consistent: once groups exceed six or seven, effectiveness drops towards whole-class levels. Groups of two to four are optimal. Groups of five are still effective. Groups of eight are just a class.
The format question: online vs in-person
A separate question from group size is whether tutoring is online or in-person. This matters less than many parents assume.
The EEF's evidence shows that online one-to-one tuition has similar effects to in-person one-to-one. And a randomised controlled trial of a 100% online tutoring programme, published in the Journal of Public Economics in 2024, found that online small-group tuition (two students per tutor) produced significant gains in test scores and grades, with results comparable to in-person programmes.
For primary-age children, online group tutoring has some practical advantages: no travel time, sessions can happen immediately after school or in the evening, children are in their own comfortable environment, and parents can observe (or at least overhear) how sessions are going. The main requirement is a stable internet connection and a reasonably quiet space.
Making the decision: a practical framework
Here's a simple way to think about which format is right for your child:
Start with group tutoring if your child needs support with curriculum subjects (maths, English, science), is preparing for SATs or the MTC, benefits from learning alongside peers, or you want frequent sessions without a prohibitive cost.
Consider one-to-one if your child has a diagnosed learning difficulty requiring specialist support, is significantly behind (more than two years below expected level), needs preparation for selective entrance exams (11-plus), or has tried group tutoring and isn't making progress.
The hybrid approach - combining regular group sessions with occasional one-to-one for specific challenges - is often the most effective and cost-efficient strategy. Use group tutoring as the foundation (building fluency, covering curriculum content, maintaining momentum) and add one-to-one sessions when a specific, targeted intervention is needed.
The EEF puts it simply: given the lower costs, small group tuition may be a sensible approach to trial before considering one-to-one tuition. Try the more affordable, evidence-supported option first. If it works - and the evidence says it usually does - you've saved a significant amount of money while delivering outcomes that are remarkably close to the most expensive alternative.
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