Performance by cohort
2 year bands · 13,897 tests
Pass rate climbs 2.1 points across the cohorts — newer WW examples clear the test more reliably than the early cars.
Pass
81.4%
Fail
13.1%
PRS
5.2%
Avg mileage at test
38,549 mi
Pass
83.5%
Fail
11.8%
PRS
4.2%
Avg mileage at test
33,295 mi
Cohort = vehicle's first-registration year band. Same model, different generations of build.