Assessment centre tips: how to prepare and stand out
Most candidates treat the group exercise as a debate to win. Assessors are watching something else entirely. Here's what they're actually scoring, and how to prepare for each stage.
On this page
An assessment centre is the final stage for most graduate schemes. By the time you're invited, your CV and video interview have already passed. The assessment centre is where multiple candidates are scored against the same competency framework on the same day.
What to expect on the day
Most assessment centres run for half a day or a full day. The format varies by employer but typically includes:
Group exercise
3 to 6 candidates work on a shared problem. You're scored individually on your contribution and team behaviour.
Competency interview
A structured interview with 4 to 6 questions based on the employer's competency framework. STAR answers expected.
Presentation or case study
You're given a brief (sometimes in advance, sometimes on the day) and present your analysis to assessors.
Psychometric tests
Numerical and verbal reasoning tests, occasionally situational judgement. May be done online before the day.
You are being assessed from the moment you arrive, not just during formal exercises. How you behave during breaks, lunch, and informal conversations with staff is noted. Treat the whole day as part of the assessment.
The group exercise
This is the exercise candidates find most intimidating and most often misread.
The typical format: 4 to 6 candidates receive a brief (a business scenario, a prioritisation problem, or a resource allocation task) and have 20 to 30 minutes to discuss and reach a recommendation. Assessors observe and score. They do not participate.
What assessors score
You are scored on individual competencies: communication, leadership, listening, commercial thinking. Each assessor typically watches 1 or 2 specific candidates, not the whole group at once.
The most common mistake
Talking the most. Candidates who dominate the conversation assume that's what assessors want. It isn't. Assessors want to see you make strong contributions and enable others to contribute.
What actually works
Build on what others say. Bring in quieter members by name ('Tom, what's your take on the cost question?'). Summarise the group's position when the discussion drifts. Make your points clearly and don't repeat yourself.
When you disagree
Disagree with the idea, not the person. 'I think there's a risk with that approach if the client has a fixed budget...' is better than dismissing or overriding someone.
Competency interview
Competency interviews at assessment centres are structured and formal. The interviewer works from a fixed question list and scores each answer against a rubric.
Use the STAR format for every answer: Situation (context), Task (your role), Action (what you specifically did), Result (what happened).
Common competency questions and what they're testing
Prepare 5 to 6 strong examples from your experience before the day. Each example should be able to answer 2 or 3 different competency questions depending on which angle you emphasise. Running out of examples mid-interview is one of the most common failure points.
Presentations and case studies
Some employers give you the brief in advance (24 to 48 hours). Others give you 30 minutes on the day to prepare. Both test the same things: structured thinking, clarity of argument, and how you handle questions.
Start with your recommendation, not your analysis. Assessors want to see you can reach a conclusion, not just describe a problem.
Use a simple structure: situation, options considered, recommendation, key risks, next steps.
Leave 2 minutes at the end for questions. Don't fill every second with content.
If you don't know the answer to a question, say what you do know and what additional information you'd need.
How to prepare (one week out)
Day 7 to 5
Research the company. Read their annual report or latest news, understand their values and how they describe their culture, know their main competitors. This fuels both the interview and the group exercise.
Day 5 to 3
Map your examples to their competency framework. Most employers list competencies in the job description or on their website. Write out 5 to 6 STAR examples and tag which competencies they cover.
Day 3 to 2
Practice out loud. Not in your head. Record yourself answering 3 competency questions. Listen back. Most people talk too fast, use too many fillers, or underspecify the 'Action' section.
Day 1 (the evening before)
Prepare your outfit, route, and arrival time. Read your examples one more time. Sleep. Do not cram new material the night before.
On the day
Arrive 10 minutes early. Eat something before you go in. Treat informal conversations with staff and other candidates as part of the assessment (because they are).
Common mistakes
Treating the group exercise as a competition
You're scored individually on competencies, not ranked against other candidates. Helping someone else make a good point doesn't hurt your score.
Using vague STAR examples
'I was part of a team that worked on a project' tells an assessor nothing. The Action step needs to be specific: what did you personally do, in what order, and why.
Not preparing questions to ask
Most stages end with 'do you have any questions?' Saying no makes you look uninterested. Prepare 2 genuine questions for each stage.
Ignoring the written exercise
In-tray and written exercises often feel less pressured than other stages, so candidates under-prepare. They're scored with the same rigour.
Breaking character between exercises
Assessors sometimes observe candidates during breaks and transitions. Complaining about the exercises, dismissing other candidates, or visibly zoning out is noted.
Frequently asked questions
What happens at a graduate assessment centre?
A graduate assessment centre runs for half a day or a full day. It includes a mix of: group exercise, individual presentation or case study, competency-based interview, and sometimes psychometric tests. You're scored by trained assessors on specific competencies. Multiple candidates attend at the same time.
How do you stand out at an assessment centre group exercise?
Bring in quieter members of the group by name. Build on what others say rather than dismissing it. Make one or two clear, well-reasoned contributions rather than talking the most. Assessors score quality of contribution and team behaviour, not who dominates the conversation.
How do you prepare for an assessment centre in a week?
Research the company's values and recent news (30 minutes). Map 3 to 5 examples from your experience to the competencies listed in the job description. Practise answering 5 common competency questions out loud. Do one timed written exercise or case study. Prepare 2 or 3 questions to ask at the end of each stage.
What do assessors look for at assessment centres?
Assessors score against pre-defined competencies: communication, problem-solving, teamwork, commercial awareness, leadership, and resilience. They want structured thinking, listening, and behaviour that matches the role. Not the loudest candidate.
What should you wear to an assessment centre?
Business professional for financial services, law, and consulting. Business casual for most other sectors. If you're unsure, check the invitation email or call HR to ask. Overdressing rarely hurts. Underdressing occasionally does.
Free Student Guide (28 pages)
Includes a full assessment centre preparation checklist, 20 STAR example templates by competency, and a breakdown of the top graduate employer processes.
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