The CAS, the interview, and the credibility check: why Nigerian applications get refused — and how to pass

A refusal rarely means an applicant wasn’t good enough. It usually means something in the file or the interview gave the officer a reason to doubt. Understanding what they are checking — and preparing for it honestly — is most of the battle. Here is how UK student decisions really work, and where Nigerian applications most often slip.

What the CAS is, and why it must match everything

The CAS (Confirmation of Acceptance for Studies) is the electronic record your university issues once you have an unconditional offer and have met their conditions. It states your course, fees, any deposit paid, and the documents the university used to assess you. Your visa application must be consistent with the CAS in every detail — course dates, fees outstanding, qualifications listed. A mismatch between your CAS and your evidence is one of the fastest routes to refusal.

The finance traps

Money is the single biggest cause of avoidable refusals — not the amount, but how it is shown:

• The 28-day rule: your funds must sit in the account for 28 consecutive days, and the closing balance must be recent (within 31 days of applying). Withdrawals that dip below the required amount during the window break it.
• Unexplained large deposits: a sudden lump sum with no traceable source raises questions. Funds should be explainable.
• Using a parent’s account: permitted, but only with the correct consent letter and relationship evidence.
• Figures that don’t match the CAS: your maintenance and outstanding tuition must reconcile with what the CAS states.

The exact maintenance figures, by country, are in our proof of funds guide, and you can model your own with the proof-of-funds estimator — which now shows the legal minimum separately from real living costs.

The credibility interview

Many Nigerian applicants are interviewed as part of a credibility assessment — a short conversation (often by video) to test that you are a genuine student who understands your own plan. Officers are not trying to trick you; they are checking that your story holds together. Common ground covered:

• Why this course and this university? You should be able to explain your choice in your own words, including modules and how it fits your goals.
• How are you funding it? Know your numbers — tuition, living costs, who is sponsoring you and how.
• What are your plans after? A coherent, honest answer — including any intention to use the Graduate Route or return home — reads far better than a rehearsed one.
• Agent awareness: you should understand your own application, not simply defer to “my agent did it.”

The biggest mistake is over-scripting. Memorised answers that don’t match your file undermine credibility; genuine, specific answers build it. We prepare clients through a dedicated interview preparation pathway that rehearses real scenarios without turning you into a robot.

Documentation discipline

Beyond finances, refusals come from missing or inconsistent documents: name mismatches across WAEC/NECO, degree, passport and application (see how qualifications are assessed); missing translations; an expired TB test certificate; or an incomplete sponsorship letter. A pre-submission checklist that an experienced eye has reviewed catches these before the officer does — our free document checklist generator is a good starting point.

How to pass: the short version

Make the CAS, your money and your story tell one consistent, truthful tale. Start the 28-day clock at the right time, keep your funds clean and explainable, prepare for the interview by understanding your own plan, and have someone experienced review the whole file before you submit. That is exactly what we do — free — and it is the difference between most refusals and most approvals.

Frequently asked