What the evidence says
The strongest evidence comes mainly from school-based tutoring studies rather than direct comparisons of every commercial tuition centre and private tutor. Use the averages as context, not as promises or a league table.
Both formats can improve learning
The Education Endowment Foundation estimates an average effect of about five additional months of progress for one-to-one tuition; its small-group summary estimates four months. Studies comparing the two directly have mixed results.
Group size changes the experience
EEF defines small-group tuition as one adult working with two to five pupils. It reports a noticeable reduction in effectiveness once groups rise above six or seven, while also stressing that teaching quality may matter as much as the exact number.
Targeting and feedback matter
The EEF evidence for both formats emphasises identifying learning gaps, choosing suitable content, providing useful feedback, linking support to normal lessons and monitoring progress.
Regular, time-bounded support can help
In the EEF one-to-one evidence, short sessions of about 30 minutes, three to five times a week, for up to about ten weeks appear to produce the strongest average effects. That is a school-focused research pattern, not a required timetable for every family.
Confidence benefits are possible, not guaranteed
In an England-only Department for Education evaluation, 61% of participating senior leaders agreed or strongly agreed that tutoring improved attainment, and 61% said it improved self-confidence. These were reported perceptions of a national programme, not a comparison proving that either private or group tuition builds confidence better.
