The congestion charge exemptions were revised last year. If the road test was carried out prior to that, then it may not be up-to-date.
The official TfL website has the details of what is currently exempt, and says :
tfl.gov.uk/modes/driving/congestion-charge/discoun...3
Cars or vans (not exceeding 3.5 tonnes gross vehicle weight) which emit 75g/km or less of CO2 and that meet the Euro 5 standard for air quality qualify for a 100% discount on the Congestion Charge.
You can check the CO2 emissions of your car on the V5C registration document. Any car registered as new with the DVLA on or after 1 January 2011 is deemed to meet the Euro 5 standard.
Some cars registered before this date will also meet the Euro 5 standard. Vans should be registered as new on or after 1 January 2012 to meet the Euro 5 standard.
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