How to Verify a Tutor's Qualifications and Results

By Renzo Diaz·5 min read

A credential is only as strong as who can confirm it, subject knowledge and curriculum knowledge and assessment knowledge are three different things, and an outcome claim needs to be read as an observation ("improved while working with me") rather than accepted as a causal one ("I caused the improvement").

A review tells you one other person's experience. It doesn't show you whether a tutor actually understands the specific programme your child is sitting, or whether a stated result means what it sounds like it means. Two other checks fill that gap — one for what a tutor knows, one for what they've actually produced.

This is the second half of the evidence stack from How to Choose a Tutor — the mechanics of verifying qualifications, curriculum fit, and outcomes specifically, once the review-verification part is done.

1. Verify qualifications directly

A tutor teaching IB Mathematics should understand mathematics. A tutor claiming IB expertise should understand the programme's actual assessment structure. But claims about qualifications deserve the same care as claims about experience, and the wording alone can do a lot of quiet work. "Engineering graduate" and "M.Sc. in Energy Engineering from Politecnico di Milano" describe very different amounts of checkable detail — the second names an institution, a degree, and a field, all of which can in principle be confirmed; the first names nothing that can.

A useful test is: who issued this? A university can confirm a degree. A professional body can confirm a membership. A school can confirm an employment history. The closer the evidence sits to whoever actually issued or recorded it, the stronger it is — and words like "expert," "certified," or "examiner" are worth noticing precisely because they can mean very different things depending on who's using them and on what authority.

It's also worth checking whether a qualification or experience claim is current. Curricula and assessment structures change — the IB's own programmes are revised on a cycle — so a tutor describing a syllabus or assessment model without making clear whether it's the current one or a previous one may be demonstrating real experience that's no longer fully relevant.

Qualifications answer whether a person is plausibly capable of teaching this material. They don't answer whether that person will teach your child effectively.

2. Knowing the subject, the current curriculum, and how it's assessed are three different things

A person can be excellent at mathematics and a poor mathematics tutor. The reverse is also true — and even "knows the subject and can teach" collapses two further distinctions that matter for a curriculum as specific as the IB.

There are really three separate layers. Subject knowledge is whether the tutor can solve and explain the mathematics or physics itself. Curriculum knowledge is whether they understand what the current programme actually requires — for IB Mathematics, the difference between Analysis and Approaches and Applications and Interpretation, SL versus HL, the current assessment structure; for IB Physics, the current syllabus and internal assessment requirements. Assessment knowledge is narrower still: whether they understand how a student is expected to demonstrate that knowledge under the actual exam and IA criteria, not just the content itself.

The Education Endowment Foundation's evidence review on one-to-one tuition is really about that third layer. It identifies specific implementation factors that separate effective tuition from simply reducing the student-to-teacher ratio: accurately identifying which students need support, understanding the specific learning gaps involved, and, critically, well-planned feedback. That's a far more demanding picture of tutoring than "the tutor knows the subject," and it's also hard to fake in a single conversation, but easy to test with the right question: not "do you know IB Mathematics," but "how do you determine whether a student is struggling with the underlying maths, the use of the GDC, exam technique, or how the question is phrased?" A tutor who has actually done this work can answer immediately, with specifics. A tutor reciting a marketing line cannot.

3. Outcomes matter — be careful with causality

"I improved my student's grade from 5 to 7" sounds compelling, but consider what it establishes on its own: nothing about whether the tutor caused it, whether the student simply increased their study time, whether their classroom teaching improved, or all of the above at once.

The same distinction applies to a testimonial. A review worded "the tutor took my child from a 4 to a 6" is a causal claim being made in someone else's voice; "my child went from a 4 to a 6 while working with the tutor" is the observable version. Both can be genuine; they don't establish the same thing.

A useful case study gives context: starting point, target, duration, subject and level, and, ideally, how the outcome was measured.

"The student improved from 5 to 7 while working with me" is an observable sequence. "I raised the student's grade from 5 to 7" is a causal claim. The evidence required for those two sentences is not the same.

4. What a tutor does before you become a client

A credential describes a background. A review describes one other person's experience. Neither shows you how a tutor actually works — but two other things can.

The first is public work. Written explanations, worked examples, recorded lessons, analysis of common mistakes on a specific paper — a tutor who publishes substantive educational material makes part of their reasoning observable before you've paid for anything. That's a different kind of evidence from a marketing page: the question isn't how much exists, it's whether it lets you actually see how this person thinks about the subject.

The second is the first real interaction. A tutor who accepts any student immediately and just finds a convenient time is doing something different from one who first tries to understand what the student is studying, where the difficulty actually is, and what's already been tried. Booking first and diagnosing later gives you less information before you commit than diagnosing first and deciding afterwards whether to begin — a short, no-obligation working session with the student, not a sales call, tells a parent more than either a conversation or a credential can, because the student experiences the method instead of being told about it. What a diagnostic-first process looks like in practice is one example, not the only shape it can take.

A tutor who lets you see the method before you commit to it is giving you something a credential can't.

Sources

Source 1 below is a primary source — an independent evidence review — quoted directly. Everywhere else in this article that isn't a numbered citation reflects Renzo's own professional experience rather than a claim requiring external citation.