Marlborough College is one of the country's leading co-educational boarding schools, and its admissions process begins earlier than many families expect. Most children are assessed in Year 6 for 13+ entry, which means registering while your child is still in Year 5. Register too late and the standard route can close before any assessment takes place. This guide sets out when to register, how the process works, and where registration sits in Marlborough's wider admissions timeline.
- Suggested by
- End of Year 5, for the standard Year 6 assessment route
- Closing date
- 9 October of Year 6 (standard), or 9 October of Year 7 (Year 7 assessment)
- Registration fee
- £360, non-refundable
- First assessment
- ISEB Common Pre-Test, taken at your child's current school
- Entry
- September of Year 9, at 13+
When to register for Marlborough College
Marlborough takes the view that you can register when you feel ready, but its own guidance suggests submitting the registration form by the end of Year 5 for the standard route. The firm closing date for the standard 13+ route is 9 October of Year 6. In practice this means registering while your child is in Year 5, so that everything is in place before the ISEB Pre-Test in the autumn of Year 6.
The lead time catches some families out, particularly those moving from the state sector or relocating to the area, who often begin looking at senior schools in Year 6 or later. Registration is simply the administrative step that puts your child into Marlborough's process. It commits you to nothing, but without it your child cannot be assessed.
The Year 6, Year 7 and Year 8 routes
One feature that distinguishes Marlborough is that it assesses across more than one year group. The majority of applicants are assessed in Year 6, which is the standard route and the one most families follow. A smaller cohort is assessed in Year 7, for which the registration closing date moves to 9 October of Year 7. Marlborough also says that, space permitting, some shortlisted applicants may be invited for assessment in Year 8.
For most families the Year 6 route is the right one, and it is the one to plan around. If your child is slightly older, or you are coming to Marlborough later, the Year 7 route may suit, but you should discuss timing directly with the admissions office rather than assume a later slot will be available.
How to register
Registration is completed through Marlborough's online registration form, with a non-refundable registration fee of £360. You provide your child's details, your contact information, and the name of their current school. The College requests a reference from that school as one of the three core elements of its assessment, so it helps to let your child's current head teacher know early that they are a Marlborough candidate. A reference written with notice tends to do more for a child than one produced at short notice.
If your child is offered and you accept a place, an acceptance fee of £2,500 falls due for pupils joining in September 2026, and overseas families pay a deposit of one term's fees. The full fee and deposit position is set out in our Marlborough College fees guide.
The full Marlborough admissions timeline
The table below shows the standard Year 6 route, which is the one most families take.
| Stage | When | What happens |
|---|---|---|
| Register | By end of Year 5 | Submit the online form and pay the £360 fee |
| Registration closes | 9 October, Year 6 | Firm deadline for the standard route |
| ISEB Common Pre-Test | September to December, Year 6 | Taken at your child's current school |
| Assessment Day | Year 6 | Writing task, group activities and interview at the College |
| Offers | Year 6 | Made to successful candidates |
| Entry | September, Year 9 | Your child joins Marlborough |
The thing to notice is that registration and assessment fall in different school years. You register near the end of Year 5, the pre-test and assessment day follow in Year 6, and entry is not until Year 9. That runway is exactly why preparation should be steady rather than crammed. Our full guide to getting into Marlborough College walks through what each stage involves.
Common registration mistakes
The most common mistake is leaving registration until Year 6, by which point the standard window has closed or is closing. If Marlborough is on your list at all, register in Year 5 and decide later, rather than the other way round.
A second mistake is treating the ISEB Pre-Test as the whole process. It is only one of three elements, alongside the school reference and the assessment day, and Marlborough weighs all three together. Preparing hard for the pre-test while overlooking the rest leaves a child underprepared for the part that often matters most, which is how they come across in person. Our guide to the Marlborough entrance exam explains the full assessment.
The third is not briefing the current school. Marlborough relies on a reference, and a head teacher caught unawares cannot give the considered account that helps a strong candidate stand out.
Not sure whether the Year 6 or Year 7 route suits your child?
Our consultants have guided families through the Marlborough process from registration to offer. A 30-minute call maps the right route, the right timeline, and an honest view of your child's chances.
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