Dux maps your course dot point by dot point, shows you which ones were never taught, and trains you on the command words and marking habits that decide your band.
Free tier: one subject, 20 questions a day. No card, no trial timer.
Chemistry · Module 5
A plant operating the Contact Process faces a new sulfur dioxide emission limit. Evaluate the compromises required.
Your answer · 96 words
The Contact Process needs high pressure and a catalyst to reach a useful rate, but the forward reaction is exothermic so higher temperature lowers yield. A lower temperature improves yield but slows the rate, and a platinum catalyst is more expensive than vanadium pentoxide.
Structural debrief
Band 4A syllabus is a contract. Every dot point in it is assessable, and the exam will not apologise for the ones your class never reached. Dux gives you a frank inventory of what is still yours to learn, and the shortest honest path to each one.
What you can already do
Verified by answers under time, not by pages opened or videos watched.
What was never taught
Named explicitly, so it stops being a vague feeling of being behind.
Chemistry · syllabus coverage
Tracked per dot point, not per subject
Module 5 · Equilibrium
74%
Module 6 · Acid / Base
58%
Module 7 · Organic
81%
Module 8 · Applying Ideas
33%
Study platforms usually optimise for time spent. Dux optimises for the number of dot points you can answer unaided, which is the only number the exam cares about.
Every dot point in your course is tracked separately. Not “Chemistry — 62%”. You see the exact dot points you have never attempted, the ones you attempted once, and the ones you can already do under time.
Questions are written in the shape the paper uses — calculation, short answer, extended response — at the mark value the paper gives them. Not a hundred one-mark multiple choice items with a motivational mascot.
Written answers are read against the marking bands for that command word: whether you made a judgement, cited the stimulus, and wrote enough for the marks on offer.
Every year the same four moves separate a Band 5 from a Band 6, and almost nobody teaches them. Dux puts the brief in front of you before you answer, then debriefs you against it after.
Chemistry · Module 5
A plant operating the Contact Process faces a new sulfur dioxide emission limit. Evaluate the compromises required.
Your answer · 96 words
The Contact Process needs high pressure and a catalyst to reach a useful rate, but the forward reaction is exothermic so higher temperature lowers yield. A lower temperature improves yield but slows the rate, and a platinum catalyst is more expensive than vanadium pentoxide.
Structural debrief
Band 4No shelf of half-built features. If it is listed here, it works on real content today.
Gap analysis, per dot point
See what the syllabus still owes you — and what it does not.
Written responses, 3–9 marks
Generated against real mark weights, with band descriptors.
Command-word coaching
All 20 NESA command words, each with the depth it demands.
Before and after feedback
A brief before you answer, a structural debrief after.
Full paper assembly
Section I and Section II, 100 marks, timed like the real thing.
Progress you can verify
Mastery is earned by answers, not time spent in the app.
43 HSC courses are mapped to the syllabus, with Chemistry and Mathematics Advanced fully decomposed to the dot point and the mark.
Free forever if you only need one subject. Paid plans add unlimited subjects, unlimited questions and full paper generation.
Start where it counts
One subject, free, no card. You will see your real coverage in about four minutes, including the parts nobody has covered yet.