When to Start Preparing for Aptitude Tests: A Timeline for 2026/27 UK Applications

Ask when to start preparing for aptitude tests and you will get the same vague answer everywhere: "start early." It is true and useless in equal measure. What you actually need is a timeline anchored to the real dates of the 2026/27 UK application cycle — when schemes open, when they realistically fill, and when the test invitation will land in your inbox — so you can work backwards from those dates to a preparation plan.

This article lays out that timeline for candidates targeting investment banking, consulting and the Big 4. The single most important thing it has to tell you is this: the deadline on the employer's website is not your deadline. Almost everything that matters happens earlier.

When to start preparing: the real shape of the 2026/27 cycle

Investment banks open first — from midsummer. Bulge-bracket firms typically post London graduate and summer-analyst roles for the 2027 intake from late June through early autumn 2026, and most review applications on a rolling basis: they assess candidates in the order applications arrive and fill seats as they go. Industry trackers report that a large share of investment banking places — commonly estimated at more than half — are effectively filled by November, well before many published deadlines. A scheme "closing in January" can be functionally closed by Halloween.

Consulting and the Big 4 follow from early autumn. These firms generally open applications for 2027 intakes around September–October 2026, with deadlines running from late autumn into winter, division-dependent. Many also assess on a rolling or cohort basis, so the early-application advantage applies here too, just less brutally than in banking.

The test comes almost immediately after you apply. This is the step that catches people. Once you submit an application, the online assessment invitation typically arrives within days, with a completion window of roughly two to seven days depending on the employer. There is no comfortable gap between applying and testing — whatever shape you are in when you press "submit" is the shape you sit the test in.

Put those three facts together and the conclusion writes itself: if you intend to apply when schemes open in September, your test preparation has to be substantially done in August. Preparation that starts when the invitation arrives is two months late.

A month-by-month aptitude test preparation timeline

July 2026 — measure, don't practise. Before touching a practice question, establish your baseline: one honest, timed diagnostic of your numerical, verbal and abstract reasoning under real test conditions. This single measurement determines everything downstream — whether you need six weeks of steady work or a fortnight of polish, and which section deserves the time. Also do the cheap reconnaissance now: list your target firms, note which assessment provider each uses (SHL, Aon/cut-e, Cappfinity, Arctic Shores — they differ far more than most candidates expect), and register interest on careers pages so opening dates come to you.

August 2026 — the core preparation window. This is where the real work belongs, in the quiet before schemes open. Careers advice converges on starting focused preparation four to eight weeks before applications open, and August is exactly that window for a September cycle. Work your weakest section first — improvement there is worth the most percentile movement — and practise timed from day one, because untimed practice trains a skill the test does not measure. By late August you want the formats of your target firms' actual providers to feel familiar, not novel.

September 2026 — apply early, in test-ready condition. Submit your strongest applications as close to opening as quality allows. Rolling assessment means the same application is worth more on 15 September than on 15 November. Expect test invitations within days of each submission, and stagger your applications rather than firing off eight in one weekend — eight assessment windows landing in the same week is how prepared candidates end up sitting tests exhausted.

October–November 2026 — the crunch. Deadlines cluster through this stretch, assessment centres begin, and later-stage tests (including re-tests sat under supervision at assessment centres) appear. Preparation now is maintenance: short, regular timed sessions to keep speed sharp, not new ground. If you are only starting in October, be realistic and triage — target the schemes with later deadlines and slower processes rather than racing rolling-deadline banking applications you cannot catch.

December 2026 onward — the long tail. Plenty of strong schemes — consulting cohorts, Big 4 divisions, corporate programmes — run deadlines into winter and beyond, and second-round openings appear in the new year. The cycle punishes lateness but it does not end in November.

Three principles that beat any calendar

Work backwards from the application date, not the deadline. Decide when you will actually submit — for rolling schemes, that should be near opening — and schedule preparation to finish before that date. This one habit puts you ahead of the majority of applicants who anchor on the published deadline.

Diagnose before you drill. Preparation time is finite, especially alongside a final-year workload. The difference between eight weeks spread evenly across everything and eight weeks aimed at a measured weakness is substantial, and you can only aim with a measurement taken before you start.

Protect the test sitting itself. However prepared you are, sit each real assessment rested, in a quiet room, on a proper device, early in your completion window rather than at the deadline at midnight. An avoidable 5% underperformance on test day can cost more than a week of preparation gained.

Start with the measurement

The 2026/27 cycle rewards candidates who are test-ready in August, apply in September, and spend October executing rather than cramming. Every part of that plan starts from the same first step: knowing, honestly, where you are now.

Before you start preparing, find out where you actually stand. The Acumen Logic Benchmark is a free, one-shot diagnostic — 20 questions under real timed conditions, taken once, like the real thing. Take it in July, and you will know exactly what your August needs to look like.