"Am I ready?" is the question every candidate asks, and a raw percentage of correct answers is a poor reply: acing easy questions does not prepare a selective competition. The ERI (EPSO Readiness Index) is our answer: an index from 0 to 100, per test and overall, designed to be comparable over time and honest about what it measures.
This page explains exactly how it is computed, what it takes into account and what it does not claim to do.
The ERI is difficulty-weighted accuracy: a hard question answered correctly weighs more than an easy one, in proportion to its difficulty level. Only questions in the realistic exam format count, over a rolling window of 7, 30 or 90 days: the index reflects your current level, not your beginnings.
Each test has its own index (verbal, numerical and abstract reasoning, EU knowledge, digital skills), and the overall index combines them weighted by your practice volume: a barely-practised test cannot artificially inflate the score. The EUFTE written test, which is not marked as MCQ, is excluded.
The same index does not mean the same thing across competitions. For an AD5 target, the overall index combines the four MCQ tests of the competition. For a CAST target, whose EPSO-side selection only includes reasoning, the overall index only weighs verbal, numerical and abstract reasoning: any practice on other modules is still measured, but does not count towards your CAST readiness.
Knowing where you stand among other candidates is useful, provided the comparison is honest. The cohort percentile is strictly optional (explicit GDPR consent, off by default) and anonymised by construction: it is computed on aggregated daily snapshots, and no percentile is shown until there are at least 50 comparable profiles in the cohort.
Here too the target matters: per-test percentiles compare all candidates (the reasoning battery is common to every EPSO profile), but a CAST overall index and an AD5 overall index do not measure the same thing, so we do not compare them to each other.
The ERI is not a prediction of success: a competition depends on the level of other candidates, the number of places and the day itself. It is a steering instrument: it tells you where to focus effort, whether your work is paying off, and how your level evolves over time. No score, here or anywhere, replaces the training it measures.
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