How Important Are School Results When Choosing a School?

School results matter, but far less than the way parents use them suggests. They are a real signal buried inside a much larger amount of noise. In facts, results are most useful as a disqualifier, not a selector. A consistently poor record tells you something. A very good one mostly tells you the school admits able children. So, use school results to build a shortlist. Use everything else to choose from it.

Almost every parent starts a school search the same way. Open the results, sort by the top number, work down the list. It is an understandable instinct. Results are public, numerical and comparable and almost nothing else about a school is. The problem is that the number answers a different question from the one parents are asking. Published school academic results tell you how a particular group of children performed in a particular year. They do not tell you how well the school taught them and they tell you even less about how it will teach your child three years from now.

This article sets out what school performance data can and cannot support, using published research rather than the usual reassurances. It also covers the situations where results genuinely should drive your decision, because there are some.

What School Results Measure?

Published results measure the attainment of one group of pupils in one year. Attainment is a product of who those pupils were before they arrived, what the school did with them and chance. Results do not separate these three.

A selective school with an entrance exam has already filtered for academic ability. Its results partly record that filter.
A school in an affluent catchment benefits from higher average prior attainment before a single lesson is taught.
Cohort composition changes year to year. Two consecutive years at the same school can differ for reasons nobody in the building controls.
Results also reflect subject entry policy. A school that enters fewer pupils for harder subjects can lift its headline figures without teaching better.

The honest framing: results are an outcome and school quality is only one input among several.

How Much of a School’s Results Are Down to the School?

Less than most parents might think. A school’s results are influenced by many things that have little to do with the school itself, especially the students who join it. When researchers account for students’ previous academic performance, the differences between schools become much smaller.

In one study, the variation between schools fell from 0.192 to 0.071 after researchers accounted for students’ earlier achievement. This suggests that around two-thirds of the original difference was linked to differences in the students schools started with
Another study found a similar pattern. Once students’ previous achievement was taken into account, the school effect fell from 0.226 to 0.069. This meant schools accounted for about 6.9% of the variation in students’ current achievement.
When researchers also accounted for other factors outside a school’s control, the figure fell further to 0.032. This suggests that simpler measures can make a school’s influence look bigger than it really is.

This does not mean schools do not matter. Even a relatively small school effect can make a meaningful difference when it adds up over five or seven years. The bigger point is that a school’s headline results do not tell the whole story. Two schools may have very different results partly because they start with students who have different levels of prior achievement.

The Prediction Problem Associated with Results

When you choose a school, you are choosing where your child will study in the future. But a school’s published results tell you what happened to students who were there several years ago. That creates a problem. Past results cannot tell you exactly what your child will achieve. Leckie and Goldstein studied this gap between past results and future performance.

Published results are based on students who joined the school several years ago. Your child will be part of a different group of students.
When researchers account for the uncertainty involved in predicting future results, only a small number of schools can be shown to perform clearly differently from the average, or from one another

What does this mean for parents? A school ranked 4th and another ranked 40th in the same area may look very different on a results table. But those rankings may not tell you that one school will definitely produce better results for your child.

Rankings can be useful as one piece of information. They should not be treated as a precise prediction of your child’s future.

Why Results Are a Narrow Measure of a Good School

Schools that raise test scores are often not the same schools that improve the outcomes parents actually care about over a lifetime. Parents appear to sense this. When choosing schools, quality of teachers and staff was rated “very important” by nearly 80%, ahead of safety at 71% and curriculum or academic performance at 60%.

A school can post excellent results and still be a poor environment for a particular child. It can also post modest results while doing genuinely difficult work with a difficult intake.

When School Results Should Carry Real Weight

Results matter most at the bottom of the distribution and when the stakes are specific. Weight them heavily in these situations.

The record is consistently poor across several years- One weak year is noise. Four is a pattern and patterns are worth acting on.
You need a specific outcome- If your child needs a particular subject combination, entry to a selective stream, or preparation for a named entrance exam, check whether the school has actually delivered it recently.
The school is small- Paradoxically, small groups make single-year results unreliable but make multi-year patterns more informative, because the school cannot hide behind averages.
Results are declining year on year- Direction of travel is more informative than position. A school moving down has usually changed something.
Subject-level results diverge wildly- Strong maths and weak English at the same school points to a departmental problem you can ask about directly.

When to Discount School Results

Discount school results heavily when the difference is small, when the school selects its intake, or when the number is doing a job it was not built for.

The gap between two shortlisted schools is a few percentage points. That gap is inside the margin of error.
The school has an entrance exam or interview. Its results partly measure its admissions filter.
You are comparing across boards, systems or countries. Different exams, different cohorts, different pass thresholds. The numbers are not comparable.
Only the toppers are published. A list of high scorers says nothing about the median child, which is the one your child will most likely be.
Your child is in primary years. Board and exit results are five to ten years away and the staff will have turned over by then.

How to Read a School’s Results Properly

The best way to read results of school is to ask for the distribution, not the headline. The questions below extract more in ten minutes than a week of reading league tables.

Ask for three to five years of results, not the most recent year.
Ask for the full distribution, including how many students scored below 60%. Schools publicise the top. The bottom is diagnostic.
Ask what proportion of the cohort was entered for the exam. Quiet exclusion of weaker candidates inflates averages.
Ask for subject-level results, not just the aggregate.
Ask about teacher retention in the relevant subjects over two years. High churn erodes results with a lag that has not shown up yet.
Ask where students went next and whether the school tracks destinations.
Ask what happens to a child who falls behind and who provides that support.

A school that answers all seven with specifics is telling you more than any table can. A school that deflects is also telling you something.

What Should Parents Weigh Alongside School Results

Everything that shapes six hours a day, 200 days a year. Results are the annual summary of that. The daily experience is the thing.

Teaching quality and staff stability, the factor parents themselves rank highest
Safety and behaviour culture, rated very important by around seven in ten parents
Commute time, which compounds across years and has no upside
Class size and how the school actually uses it
Fit with your child’s temperament, especially coursework versus exam performance
Whether the school treats mistakes as failures, which is a known marker of results-obsessed cultures where students become afraid to attempt challenging tasks

To Sum Up

The importance of school results is real but badly misjudged. Results are a rear-view mirror with a smudge on it. They show a group that has already left, filtered through an intake the school chose, measured against a syllabus that may have changed.

Use them the way a recruiter uses a CV. They are good for ruling schools out and building a shortlist. They are poor for picking a winner from that shortlist, because by that stage the differences between the numbers are smaller than the uncertainty around them.

What remains after you set the numbers aside is the part that actually decides your child’s experience: who teaches them, whether those teachers stay, what happens when your child struggles and whether they want to walk through the gate each morning. None of that appears in a table. All of it appears on a visit, if you ask the right questions.

Frequently Asked Questions

Do good results mean good teaching?

Ans. Not reliably. Often variation in school results traces back to student intake differences rather than teaching.

Should I pick a school with slightly better results but a longer commute?

Ans. Almost never. A few percentage points is inside the margin of error. An extra hour spent on commute every single day is not. So, let not better results be your deciding factor.

How many years of results should I look at?

Ans. When choosing a school, three to five of previous years’ results records are good to go with. Single-year figures are volatile, especially at small schools.

What is the best way to choose a school?

Ans. The best way to pick a school for your child is to match your child’s unique needs with a school’s environment and curriculum rather than relying only on test scores or rankings the school has received.

How important a role do teachers play in good results?

Ans. Teachers play an important and direct role in helping students achieve good academic and personal results. They offer clarity when teaching, help through doubts, explain the bigger context of things and assist students in identifying strengths and weaknesses.