Stop studying blind. POSISYS™ combines adaptive question practice, full mock exams, daily mindfulness, a built-in Ready Reckoner and Darren's insider Pre-Study Guide — everything you need to walk into your five-day assessment prepared, not panicked.
POSISYS™ Pro
Early Access Registration
£89 one-time
No subscription · No annual fee · All updates included
Be first in line when we launch.
The Gas and Vapours Ex01–04 assessment is a five-day residential programme. Theory sessions. Four timed practicals. A multi-choice written exam. An enormous body of technical knowledge covering zones, protection concepts, cable glands, inspection grades, IS circuits, Zener barriers and more.
The cost of a single attempt runs from £790 to £1,500 before travel and accommodation. A resit costs £400 or more. Fail twice and you are looking at real money — and a real dent in your confidence and your career.
Until POSISYS™, there has been no dedicated preparation tool for this assessment. No app. No adaptive question bank. No mock exam. Engineers have been arriving at assessment centres having done nothing but read a textbook — and hoping for the best.
POSISYS™ is the answer to that. Not a quiz app dressed up as preparation. A complete preparation, confidence and mindset system — built by an engineer who has been exactly where you are.
Hundreds of original example questions covering every topic in the Gas and Vapours assessment — zones, ATEX marking, protection concepts, cable glands, inspection grades, IS systems, Zener barriers, fault finding and more. The SM-2 spaced repetition algorithm tracks what you know and what you do not, surfacing weaker areas automatically. Every question is written and verified by Darren personally. Your revision time goes exactly where it is needed.
Core FeatureSit a complete mock assessment under timed conditions, built to mirror the format and pressure of the real thing. Review every answer with detailed explanations. Identify your weak areas before assessment day, not during it. The mock exam builds the mental stamina and familiarity with timed conditions that separates candidates who pass from those who freeze.
Core FeatureEnter your assessment date and the app counts down every day. See precisely how many days you have and how your preparation is tracking against that deadline. Build a daily habit around your actual timeline — not a vague "I should probably revise" intention. The countdown makes your assessment real and your preparation purposeful.
Core FeatureFive minutes of guided mindfulness every day, designed for engineers — practical, no-nonsense and built around the specific anxiety that comes with a five-day residential assessment. Exam stress is real. It affects experienced, capable engineers just as much as anyone else. POSISYS™ includes this because it works. Start the day before your assessment date and continue through the five days themselves.
Core FeatureEvery key reference table, classification and designation you need — gas groups, temperature classes, zone definitions, ATEX marking breakdowns, protection concept summaries, inspection grades, cable gland types — searchable and always with you. The Ready Reckoner is the reference tool Darren wishes had existed when he sat the assessment. Now it does.
Core FeatureDarren's complete Pre-Study Guide — written from real experience across multiple sittings of the Ex01–04 assessment — is built directly into the app. It tells you exactly what to study before you arrive at the assessment centre, in what order and what to prioritise. Written by someone who has been there. Not derived from a textbook. Not assembled from a course outline. From experience.
Core FeatureThe complete Ex01–04 preparation system. Everything in one app.
£89
One-time payment · No VAT · No subscription · Lifetime access
For engineers preparing for their five-year Refresh assessment.
£49
One-time payment · No subscription
Register for early access and we will notify you when the Refresh Pack launches.
POSISYS™ is in development. We are building it carefully — every question verified, every feature tested, every line of code reviewed. It will not be rushed.
Register your free early access now and you will:
No payment required now. No obligation. Just one email when we are ready — and you are first in line.
Free. No payment required. One email when we launch.
Every question in POSISYS™ is an original example question, written and verified by Darren. Engineering is precise — and if you ever find anything that needs amending, we want to know immediately. Anyone who sends a correction we incorporate will receive a thank-you gift from The Engineering University. Your expertise protects every engineer who uses POSISYS™ after you.