Ceteris Admissions · Oxbridge economics
Built on the method of an Oxbridge economics admissions tutor. Practise with the AI Interviewer and get detailed feedback after every interview, with a mark scheme for every question and TMUA and TARA preparation in the same pass.
Applicant Pass with the AI Interviewer £249Interview Pack £109TMUA £99 · TARA £79
InterviewerHere are five students and their friendships. Draw the network and work out each person’s utility.
You, spokenLet me draw it first. Asha, Ben and Cara are a triangle… then Cara to Dev, and Dev to Eli. So: Asha 10, Ben 14, Cara 17, Dev 12, Eli 7.
InterviewerNow add 2 for every friend of a friend who isn’t already a friend. What changes?
You, spokenDev jumps from 12 to 16, because he’s the bridge. And the Cara–Dev friendship helps Asha and Ben, who didn’t choose it.
InterviewerAsha and Eli could be friends, worth 3 each, but it costs each of them 4. Does it form?
You, spokenAsha gets 3 plus 2… actually no, she already reaches Dev, so just 3. That’s less than 4, so she says no.
Interview ended · feedback ready
Feedback 3.8 / 5Example
You modelled the network cleanly and saw that Dev gains most because he is the bridge. Part (c) was slower: you first gave Asha the friend-of-a-friend benefit, corrected it, then stopped before asking whether the friendship should form.
Practise Land next: in (c) you stopped at “she says no” without judging whether the friendship should form.
“Asha refuses, since 3 is less than 4. But Eli gains 5 and Ben gains 2, so the group gains 10 against a cost of 8. It should form and doesn’t, because Ben’s gain is an externality. A side payment from Eli or Ben would fix it.”
Then the full model answer and mark scheme for the question.
A list tells you what might be asked. It cannot show you how you sound answering it, and that is what tutors judge. These are the mistakes we see most, and what the pack does about each.
The AI Interviewer in the Applicant Pass hears you think aloud and gives feedback on how you reasoned, not just where you ended up.
The commonly asked classics come with the twists tutors use on rehearsed candidates. Most questions will be new to you, as they are in the room.
Every maths question is worked step by step, with the technique named at each step, so you have a way in.
Every question comes with the follow-ups a tutor might ask, and the AI Interviewer follows up on your own answer.
Each question says what you need to know and links the Ceteris lesson that teaches it.
A mark scheme for each part, written by an Oxbridge economics admissions tutor, with the weak moves to avoid.
An interview tests how you work through a problem you have not seen. So the pack teaches seven moves that work on any question, and labels them in every model answer and in every piece of AI feedback.
How it sounds in the room
Pin it down “So I walk two steps from each person. Inside the triangle everyone is already friends, so those don’t count.”
Check it “Asha gets 5 too. Actually no, she already reaches Dev through Cara, so she only gets the 3.”
Land “The group gains 10 against a cost of 8. It should form and doesn’t, because Ben’s gain isn’t counted.”
From the model answer to the question below.
The questions are in the style tutors ask, written by an admissions tutor who prepares applicants for these interviews. Three come from a real Cambridge Economics interview, including this one. Answer it out loud first, then open what you need to know, the mark scheme and the examiner’s report.
Loading the sample question…
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The AI Interviewer, with interview, TMUA and TARA preparation
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For the interview on its own
Pick the test you are sitting
Cambridge Economics, LSE, UCL and others.
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Both test packs come with the Applicant Pass.
Mock interview with Luke: one to one, £450 for 5 hours, booked and paid on EconCoaching. Open to anyone, with or without a pass. See dates
A year earlier? For parents of Year 12 students: the Year 12 Early Starter, £99. For essay competitions: the Essay Competition Pack, £79.
One-off payment, charged when you order. Nothing renews. Payment is taken by Stripe. Sold by Luke Masom trading as Ceteris, hello@ceteris.app. Terms · Privacy. If the student is under 18, a parent or guardian should make the purchase.
Luke Masom is a Cambridge economist and admissions coach who has spent six years helping students apply for economics degrees. He went through the Cambridge Economics interview himself, and three questions in the pack come from it.
Luke runs Ceteris and EconCoaching.
Add your email address and get a report on questions practised in each theme, what is marked confident, and what to practise next.
Practise 30 questions across at least three themes, about ten full interviews’ worth, to earn a certificate with its own verification link.
Every price and what it includes is on this page. One payment, nothing renews, and the student can start the same evening.
Economics at Cambridge; Economics and Management, PPE and History and Economics at Oxford; HSPS, Land Economy and History and Politics; and economics degrees at other universities that interview. The questions test economic reasoning, which every economics interview looks for.
Three come from a real Cambridge Economics interview. Twenty are the questions most often reported online, written in our own words with the twists interviewers use on candidates who have rehearsed them. The rest are new, written in the style tutors ask, because an interview tests how you handle a problem you have not seen.
It opens with a question from the pack, a Cambridge-style maths problem followed by a discussion, or your own personal statement. You answer out loud (your browser turns speech into text) or by typing, and it follows up on what you said, as an interviewer would. At the end it writes feedback: what went well, what to change and what a stronger answer would have done, with a score out of 5 on each criterion, the mark scheme points you reached, and the techniques you used and missed. It comes with the Applicant Pass. If you already hold the Applicant Pass without it, you can add it for £100.
After paying, the student is signed in straight away, and the order confirmation email carries a sign-in link. Use the student’s email address at checkout if the student will be the one practising.
Membership covers Learn and the games. The packs add the interview questions and mark schemes, the TMUA and TARA mocks, parent reports and the certificate, and the Applicant Pass adds the AI Interviewer. The pass also includes the full library, so a member does not need both.
Yes. Oxford interviews are held online and many Cambridge Colleges interview online too, so the preparation is the same wherever the student lives. Prices are shown in pounds, US dollars, Singapore dollars or Hong Kong dollars, and you pay in the currency you choose.