It has been introduced across Europe with the aim of improving road safety and maintaining high standards of driving.
Drivers who have acquired rights receive their DQC when they have completed their first 35 hours of periodic training.
Drivers with licences for both PCV and LGV are covered by one DQC which is valid until 9 September 2019.
These include the theory and practical tests drivers will need to pass before they can gain their full vocational driving licence.
Every hazard is worth a maximum of 5 marks and a score of 67% is required to earn a pass.
The case studies are basically short scenarios based on situations that are highly likely to happen in one's working life as a lorry driver.
The test has been written by industry experts and uses realistic scenarios that a lorry driver may encounter when out on the road.
All drivers need to complete 35 hours of periodic training every five years on an ongoing basis to keep driving for a living.
[5] Drivers of both PCV and LGV vehicles only need to do one set of periodic training every 5 years.