Classroom tests tell you whether a child understood the material covered last term. GL assessments do something different: they measure the underlying skills that drive academic success and compare a child to thousands of same-age pupils across the UK and internationally. For families choosing between Jakarta's many international schools, that external benchmark is one of the few genuinely objective comparators available.
What GL Tests Measure
GL Education produces five assessments widely used in British prep and international schools. The Progress Test in English covers reading comprehension, grammar, vocabulary, and inference. The Progress Test in Maths focuses on number reasoning, multi-step problem-solving, and data interpretation. The Progress Test in Science tests conceptual understanding in biology, chemistry, and physics, prioritising reasoning over memorised facts.
Two additional tests focus on early literacy. The New Group Reading Test examines reading accuracy, comprehension, and processing speed. The New Group Spelling Test assesses phonics knowledge and applied spelling patterns. All five are typically administered once a year from Year 3 onwards. None reward rote learning; they reward secure foundational understanding and the ability to apply reasoning to unfamiliar material.
How the Standard Age Score Works
Every GL result is reported as a Standard Age Score. The SAS places a child's performance within a large, statistically normed population of same-age students. The key reference points: 100 is the precise average; 85 to 115 is the range in which most children fall; scores above 115 indicate performance well above age expectation; scores below 85 fall below typical expectation.
The score is re-normed annually against tens of thousands of pupils, which means a harder test does not produce lower scores. This stability is the key advantage over internal school grades, which shift depending on what was taught, how the paper was set, and how the class as a whole performed. A one-year dip in SAS is usually explained by context. What matters is the pattern across several years.
ISJ's GL Results Explained
ISJ's most recent GL results: English 122, Maths 118.7, Science 119.7, Reading 113, Spelling 116.7. Every subject sits above 115, the threshold for "significantly above average." British independent prep schools typically cluster between 104 and 112 on these measures, so a school-wide average above 115 across five subjects puts ISJ among the highest-performing prep cohorts by this benchmark.
The Reading score of 113 is the lowest of the five. This reflects something specific to Jakarta: the school draws heavily from multilingual families for whom English is a second or third language. Reading comprehension and vocabulary develop more slowly for bilingual learners in the early years. A cohort average of 113 in Reading, given that context, indicates strong foundational teaching alongside a predictable language acquisition curve.
Reading Individual Results as a Parent
Sub-scores matter as much as the headline number. The English test might show strong inference but weaker vocabulary; the Maths test might reveal confident number reasoning but less fluency with data handling. These patterns help teachers design targeted support rather than broad remediation. Parents reviewing results with a teacher should ask not just about the overall SAS but about which sub-skills are strongest and where the growth opportunity lies.
Multilingual children in particular often show lower SAS in vocabulary-heavy tests in Years 3 and 4, followed by sharper growth from Year 5 once linguistic competence consolidates. This is a well-documented pattern for bilingual learners. In Maths and Science, where language demands are lower, multilingual pupils frequently perform at or above monolingual peers from the outset.
Families who want to understand how these results connect to ISJ's broader approach can read more in the article How Assessment Works in British Schools.
What is a good SAS score?
Most children score between 85 and 115. Scores above 115 indicate performance well above age-level expectation. The national average is set at 100 each year through re-norming.
Do GL scores change if the test is harder one year?
No. GL re-norms the test annually, so a harder paper does not push scores down. The SAS reflects a child's standing relative to peers, not raw difficulty.
Why might a child score differently on GL tests than on classwork?
GL measures underlying reasoning and comprehension rather than recently taught content. A child who performs strongly on taught material may reveal gaps in foundational skills, and one who seems hesitant in class may demonstrate strong independent reasoning on a GL paper.
Are GL tests fair for multilingual learners?
Yes, though multilingual children typically develop vocabulary more slowly in English-language tests during the early years. Maths and Science scores are generally unaffected by bilingualism, and vocabulary-heavy scores often catch up sharply from Year 5.
Can tutoring improve GL scores?
Not meaningfully. GL rewards reasoning and comprehension built over time. The most effective support is consistent reading at home, everyday mathematical discussion, and broad vocabulary exposure.
How often do children take GL assessments?
Once a year from Year 3 onwards is standard in British prep and international schools using the GL suite.
What should parents ask when reviewing results with the school?
Ask about trends across multiple years, which sub-skills are strongest, and how GL results compare to teacher observation in class. A single score in isolation tells you less than the pattern of development over time.