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About this exam

The Greek Category D theory examination is the knowledge test that candidates must pass to obtain a professional bus driving licence (άδεια οδήγησης Κατηγορίας Δ) in Greece. It is aimed at drivers who intend to work professionally with buses, including urban and interurban passenger transport, and it assumes a solid grounding in ordinary car driving rules before the heavier vehicle categories are addressed. The test is delivered as multiple choice and draws on the full range of knowledge a bus driver needs: traffic law and road signs, hazard perception and safe following behaviour with a long, heavy vehicle, the weight, dimension and load rules that apply to buses, EU driver hours and tachograph use, basic mechanics and daily pre-trip checks, first aid and accident procedure, economical and environmentally aware driving, and the conduct and documentation expected of a professional carrying passengers. Preparation works best in layers: first consolidate general traffic law and signs, then move to the vehicle-specific and regulatory material (masses, dimensions, tachograph, passenger safety), and finish with emergency and environmental topics. Practising under timed conditions and reviewing every wrong answer against the underlying rule, rather than memorising answers, is what separates a comfortable pass from a marginal one. This page is an independent study resource and is not affiliated with any Greek authority.

What you'll study

Common questions

About Greece Category D Theory preparation

What is the format of the Greek Category D theory exam?

It is a multiple choice test delivered electronically, with each question offering a set of answer options from which you select the correct one. Questions are drawn from the official syllabus covering traffic law, road signs, vehicle knowledge, driver hours and safety topics. The exact structure and interface are set by the competent Greek authority, so confirm current details on its official site before your appointment.

How many questions are there and how long do I have?

The official examining body sets and periodically revises the number of questions and the time allowed, so any figure you see quoted online may be out of date. Rather than relying on second-hand numbers, check the current specification published by the competent Greek authority. In practice, the time pressure is modest if you know the material, so accuracy matters more than speed.

What score do I need to pass?

The passing threshold is determined by the competent Greek authority and is not fixed for all time. Look up the current requirement on the official site rather than trusting forum posts. As a study target, aim to answer consistently above the published threshold on practice sets, so that a few careless errors on the day do not push you below the line.

Can I retake the exam if I fail?

Retakes are generally possible, but the number of attempts, the waiting period between them and any additional fee are governed by the competent authority's rules and can change. Confirm the current retake policy directly with the examining body or your driving school before booking. If you do fail, diagnose which domain cost you the most marks before rebooking.

How difficult is the Category D theory test?

The traffic law and road sign material is familiar to anyone with a car licence, so the difficulty concentrates in the professional domains: driver hours and tachograph rules, mass and dimension limits, and passenger safety obligations. Candidates who treat these as memorisation tend to struggle, because the questions are phrased as situations. Understanding the reasoning behind each rule makes the test feel straightforward.

In what order should I study the eight domains?

Start with traffic law and road signs, since they underpin everything else and carry the largest share of the syllabus. Then take vehicle categories, weights, dimensions and loads together with driver hours and tachograph, as both are rule-based and benefit from fresh attention. Finish with mechanics and pre-trip checks, first aid and emergencies, environmental driving, and professional conduct.

What are the most common reasons candidates fail?

The usual causes are weak knowledge of driver hours and tachograph recording rules, confusion over mass and dimension limits, and misreading scenario questions that hinge on one word such as 'must' versus 'should'. Rushing through questions and changing correct first answers also costs marks. Reviewing every error against the underlying regulation, rather than memorising the answer, fixes all of these.

Does holding a car licence help me prepare?

It helps with signs and general right-of-way rules, but do not assume it covers the professional content. Bus-specific material such as passenger safety, load security, tachograph obligations and vehicle dimensions is largely new, and some car habits, like following distance, need revising for a much heavier vehicle. Treat the Category D syllabus as a fresh subject with a familiar foundation.

How should I prepare in the final week?

Spend the last week on timed practice sets covering all domains, then re-read the rules behind every mistake. Give extra time to whichever domain produced the most errors. Avoid learning new material at the last minute; consolidate instead. Check your appointment details and required documents with the competent authority in advance so administrative issues do not derail an otherwise solid preparation.