Using official source materials significantly increases the likelihood of passing compared to using unofficial, unlicensed revision apps.

The market is flooded with unofficial study apps and mock exams. However, official licensing bodies warn that many of these unlicensed resources contain outdated or incorrect questions. Research shows that candidates who prepare using unofficial materials are statistically less successful in their final exams. To ensure success, candidates should base their study on official source materials. These include the Highway Code, official DVSA guides, or official national theory test kits. These official materials are updated constantly to match the real testing pool.