Understand what you are sitting before you revise
The professional driving theory test is not one exam, it is two separate appointments made up of four parts. Module 1 covers the multiple-choice paper and the hazard perception clips. Module 2 is the Driver CPC case-study test. Module 3 is your practical driving, and Module 4 is the CPC practical demonstration — the walk-round-style questions on loading, security and safety.
The multiple-choice paper for LGV and PCV drivers is 100 questions with a pass mark of 85, answered in under two hours. Hazard perception is 19 clips containing 20 developing hazards, scored out of 100 with a pass mark of 67 for vocational candidates — noticeably higher than the car test. Module 2 gives you seven case studies and roughly 50 minutes, needing 40 out of 50.
Knowing those numbers matters, because they tell you where to spend your revision. A candidate who scores 92 on the multiple choice and 60 on hazard perception has not failed on knowledge — they have failed on timing and clicking technique, which is a completely different thing to fix.