Kesteven and Sleaford High School 11+ Guide 2026: Admissions, Exam and Prep

Kesteven and Sleaford High School is a selective state grammar school for girls aged 11 to 16, with a co-educational sixth form, tracing its origins to a private venture founded by local businessmen in 1902. For September 2027 entry, girls applying to Kesteven and Sleaford High School must register for the Lincolnshire Consortium 11+ test administered by GL Assessment, sit two reasoning papers in September 2026, and achieve the shared qualifying score of 220 to be considered for one of the school's 124 Year 7 places. Independent 11+ guides put demand at around four qualifying applicants for every place, and a Freedom of Information disclosure from Lincolnshire County Council shows the furthest successful Year 7 offer has ranged between roughly 18.5 and 34.8 miles from the school gates over the five years to 2024 — a useful, rarely-published signal of just how wide the school's genuine catchment really is. This guide covers the school's history, its distinctive admissions criteria, the exam format, key 2026 dates, its Outstanding Ofsted rating, and how to build an effective preparation plan.

Key Facts: Kesteven and Sleaford High School

About Kesteven and Sleaford High School: History and Character

Kesteven and Sleaford High School owes its existence to local demand for girls' secondary education. In 1902, a syndicate of Sleaford businessmen purchased a house on Southgate designed by the architect Charles Kirk and opened it as a private high school for girls, admitting 23 pupils on its very first day, 6 May 1902. That founding act gave Sleaford's girls their own dedicated secondary school more than a century before it became the selective grammar it is today.

The school passed into the control of Kesteven County Council in 1919, becoming a maintained secondary school for girls rather than a private venture. The 1944 Education Act brought grammar school status and the abolition of fees, and the school continued through the various waves of comprehensivisation that reshaped English secondary education in the second half of the twentieth century while retaining its selective, single-sex character — one of only a handful of Lincolnshire schools to do so. The school converted to academy status on 1 November 2011, becoming part of The Robert Carre Trust, a small multi-academy trust that today comprises exactly two schools: Kesteven and Sleaford High School itself and its long-standing sister school across town, Carre's Grammar School, the boys' selective grammar founded in 1604.

Today the school occupies its site on Jermyn Street, close to Sleaford railway station, and has been led by Headteacher Josephine (known to the school community as Jo) Smith since 2015. Kesteven and Sleaford High School has been girls-only at Year 7 to Year 11 throughout its modern history, but has admitted boys into its Sixth Form since 2015 through the Sleaford Joint Sixth Form, a formal partnership originally established between the two Robert Carre Trust schools. As of the 2025–26 academic year, that partnership has expanded further to include a third Sleaford secondary school, St George's Academy, giving Sixth Form students at Kesteven and Sleaford High School access to more than 65 courses spread across three school sites — a genuinely unusual level of town-wide sixth form collaboration for a market town the size of Sleaford.

Is Kesteven and Sleaford High School Part of the Lincolnshire Grammar School Consortium?

Yes. Kesteven and Sleaford High School is a full member of the Lincolnshire Consortium of Grammar Schools — the group of 14 selective schools across the county that share a single 11+ entrance test set and standardised by GL Assessment. This means a girl registering for Kesteven and Sleaford High School sits exactly the same two papers, on exactly the same dates, as a child applying to King Edward VI Grammar School, Louth or Queen Elizabeth's High School, Gainsborough. A single qualifying score of 220 or above makes a girl eligible to apply to Kesteven and Sleaford High School and to any other consortium school the family lists on their Common Application Form — there is no need to register separately for each school or sit different tests on different weekends.

The 14 Lincolnshire Consortium grammar schools and their published admission numbers are:

Caistor Grammar School, in North Lincolnshire, is the one notable exception: it sits outside the consortium and sets its own separate verbal reasoning tests on different dates. Families interested in Caistor as well as Kesteven and Sleaford High School must register and sit tests separately for that school. For the wider regional picture, see our Lincolnshire 11+ hub guide, and our companion guides to Kesteven and Grantham Girls' School, QEGS Horncastle and Bourne Grammar School.

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What Does the Lincolnshire 11+ Test Cover?

The Lincolnshire Consortium entrance test used for Kesteven and Sleaford High School is provided by GL Assessment and consists of two separate papers sat on consecutive Saturdays. There is no mathematics paper and no English comprehension or creative writing component — the entire test is built around reasoning ability.

Paper 1 — Verbal Reasoning (VR): Approximately 80 questions answered in around 50 minutes. Verbal Reasoning tests a girl's ability to work with language patterns, codes, sequences and logical relationships between words. Question types include analogies, letter and number codes, hidden words, compound words, synonym and antonym matching, and word-relationship problems. A strong vocabulary built through wide reading, combined with quick pattern-spotting, is essential for this paper.

Paper 2 — Non-Verbal and Spatial Reasoning (NVR/SR): Approximately 70 questions divided into five strictly timed sections of around 7 minutes each, where the invigilator reads instructions before each section and children cannot return to earlier sections once time is called. Non-Verbal Reasoning tests the ability to spot rules and relationships in abstract shapes: series, matrices, analogies and figure classification. Spatial Reasoning extends this into three dimensions, covering cube folding, block counting, shape rotation, nets and fold-and-punch problems.

All raw scores are age-standardised before being combined into the final qualifying score. This adjustment accounts for a girl's exact date of birth, so that a summer-born girl is not disadvantaged relative to an autumn-born classmate who has had almost a year more schooling. The two standardised scores are added together, and girls reaching 220 or more are deemed to have qualified — though, as with all Lincolnshire consortium schools, qualifying is a necessary but not sufficient condition: the school's oversubscription criteria then decide who is actually offered one of the 124 places.

What Are the Key 2026 Dates for Kesteven and Sleaford High School Admissions?

For girls seeking September 2027 entry to Year 7 at Kesteven and Sleaford High School, the following 2026 timetable applies across the Lincolnshire Consortium:

Registration is completed through Kesteven and Sleaford High School's own website, but families must separately submit a Common Application Form to Lincolnshire County Council listing all their preferred schools before the 31 October 2026 deadline. Missing the CAF deadline means a child will not be considered through the coordinated admissions process, even if she sat and qualified in the 11+ test. Official registration and admissions arrangements are published on the Kesteven and Sleaford High School admissions page and on the Lincolnshire County Council school admissions page. For the national context, see our 11+ exam dates 2025–2026 guide.

How Competitive Is Kesteven and Sleaford High School, and How Does the Oversubscription Criteria Work?

With 124 Year 7 places and no defined catchment area, Kesteven and Sleaford High School is regularly oversubscribed among qualifying girls; independent 11+ preparation guides estimate around four qualifying applicants for every available place. As with all English state schools, any child with an Education, Health and Care Plan naming the school is admitted ahead of every other criterion, as a matter of law. Beyond that statutory first step, Kesteven and Sleaford High School's own published oversubscription criteria, confirmed by Lincolnshire County Council's admissions record for the school, are applied strictly in the following order to girls who have already achieved the 220 qualifying score:

1. Looked-after children and previously looked-after children
2. Children registered for Pupil Premium — that is, children who have been eligible for Free School Meals at any point in the previous six years (excluding statutory infant free school meals)
3. Siblings with a brother or sister already attending a Robert Carre Trust school
4. All remaining qualifying girls, ranked by straight-line distance from home to school

Distance, where it is the deciding factor, is calculated electronically by Lincolnshire County Council's School Admissions Team to three decimal places, as a straight-line measurement between the Post Office Address Point of the family home and of the school. If two or more applications cannot be separated by distance for the final available place, the school uses an independent lottery, drawn by a person with no connection to the school, as the tie-break.

Because there is no catchment area, girls living anywhere in Lincolnshire — or beyond, through inter-authority arrangements — can apply to Kesteven and Sleaford High School provided they qualify in the test. Just how wide that genuine draw area is can be seen in a Freedom of Information response Lincolnshire County Council issued in mid-2025 (reference 12435989): the furthest distance from which a girl was offered a Year 7 place ranged from 18.5 miles in 2020 up to 34.8 miles in 2022, and stood at 19.1 miles in the most recent 2024 intake. In practice, most successful applicants live in Sleaford itself or in the surrounding villages of North Kesteven, but families considerably further afield, including some in neighbouring Nottinghamshire and Leicestershire border areas, have secured places once the priority categories above are exhausted and places are still available on a distance basis.

What Is the Sixth Form and Academic Record at Kesteven and Sleaford High School Like?

Since 2015, Kesteven and Sleaford High School's Sixth Form has operated jointly with Carre's Grammar School as the Sleaford Joint Sixth Form, both schools sitting within The Robert Carre Trust. As of the 2025–26 academic year, that partnership has grown to include a third school, St George's Academy, meaning Sixth Formers at Kesteven and Sleaford High School can now choose from more than 65 courses delivered across three campuses — a considerably broader offer than a single school of its size could sustain alone, while Years 7 to 11 remain a single-sex girls' environment.

Academically, the school has a strong and consistent record. Its most recent Ofsted inspection, carried out on 19 and 20 November 2024 and published on 19 December 2024, rated Kesteven and Sleaford High School Outstanding across every individual judgement area assessed: quality of education, behaviour and attitudes, personal development, leadership and management, and Sixth Form provision. Inspectors reported that pupils are "proud to attend Kesteven and Sleaford High School," praised a curriculum that is "exceptionally broad and ambitious" with robust support for pupils with SEND, and noted that "no time is wasted in lessons" and that pupils are "polite and respectful" around the school. One parent quoted in the report captured the school's ethos succinctly: "the school really does want every child to flourish." At the time of the inspection the school had 753 pupils on roll, including around 122 in the joint Sixth Form.

Beyond the classroom, the school offers a broad extracurricular programme spanning sport, music, drama and a wide range of clubs and societies, consistent with the wider ethos found across Lincolnshire's grammar schools. The Outstanding rating across all categories, awarded following the November 2024 inspection, places Kesteven and Sleaford High School among a small number of English secondary schools to achieve top marks in every area Ofsted now assesses under its post-September 2024 inspection framework.

How Should My Child Prepare for the 11+ at Kesteven and Sleaford High School?

Preparation for Kesteven and Sleaford High School should focus squarely on the two subjects tested in the Lincolnshire GL Assessment: Verbal Reasoning and Non-Verbal and Spatial Reasoning. Neither subject forms part of the national curriculum, so girls need structured, progressive practice well before test day in September 2026.

Verbal Reasoning rewards both vocabulary knowledge and the ability to identify abstract patterns in language. The strongest foundation is wide reading — girls who read widely across fiction, non-fiction and quality journalism develop vocabulary organically, which pays off directly in synonym, antonym and word-relationship questions. Alongside reading, girls should work through the full range of GL Assessment VR question types under timed conditions, since the roughly 37 seconds per question allowed in Paper 1 demands genuine fluency, not just eventual accuracy.

Non-Verbal and Spatial Reasoning is highly learnable but requires a different style of preparation. Many girls find NVR unfamiliar at first, since it draws on no academic knowledge at all — but with targeted, repeated practice on each question type (matrices, series, analogies, figure classification, cube folding, rotation and nets), most girls improve substantially over a preparation period of several months. The five strictly timed sections of Paper 2 also demand practice under sectioned, not just full-paper, timed conditions, so that a girl is comfortable working to the invigilator's pace on the day.

Given how competitive the 124 places at Kesteven and Sleaford High School typically are once the priority categories are applied — and with independent guides putting demand at around four applicants for every place — a personalised one-to-one approach is particularly valuable: it lets a tutor identify precisely which question types or skills a girl is weakest in, and design a programme that closes those specific gaps rather than relying on generic practice alone. At Leading Tuition, our specialist 11+ tutors are experienced with the Lincolnshire GL Assessment and support families across Sleaford, Grantham, Boston and the wider county, including through online tuition.