Crestellar Academy

The all-in-one HKDSE Maths self-study app — real 名校 exam questions, timed mock exams, natively typeset past-paper solutions, revision notes, and every subject's 5** cutoff since 2012. Free to start, no account needed.

PRACTICE ENGINE • Thousands of real MC and long questions from Hong Kong's top schools — filter by year, topic and difficulty, or take on the out-of-syllabus Challenging tier • Timed S1–S6 mock exams that mirror the real HKDSE Paper 2, slot by slot • Instant marking with a grade estimate, per-question review, and per-topic time + accuracy analysis • DSE LEVEL PREDICTOR: your mock score is converted using the REAL cut-off scores from the last five years of HKDSE Mathematics — see where you sit on the level ladder and how many more questions reach the next one. On every mock exam, new or replayed • One-tap drill on your weakest topic, so every session targets what matters • Long-question sessions your way: 5–50 per session, unseen questions first • Save any question to revisit; share a branded result card in one tap

5** SOLUTIONS • Every question carries a complete marking-scheme solution — natively typeset, never a scan • Max plans unlock advanced solutions: faster 5** techniques, exclusive calculator programs, and Typical Questions & Skills for all 19 chapters

WRITE ON THE QUESTION — NEW • Write on the question itself — in a timed quiz, the Long Question bank, or any question you saved: pen, dotted pen, highlighter and eraser, pinned to the figure so they scroll and zoom with it — or pull up a blank scratch sheet under it • Hold at the end of a stroke and it snaps perfect — lines, circles, ellipses, rectangles, squares, triangles, polygons — even from a rough sketch that never closed • Then drag its corners and endpoints to adjust it. One undo puts your freehand back • Four pen colours, four highlighter colours, and an eraser for a whole stroke or just the bit you rub out • Two fingers scroll and pinch while a tool is selected; Apple Pencil always draws and double-tap swaps to the eraser • Workings never leave your iPad, and are never stored

VISUAL MATH LAB • 21 interactive topics: drag real DSE figures and watch the maths respond live, up to 10 exam question types per lab • AM–GM and Circle Angle Theorems are fully free, no account • Read every other lab free; upgrade to interact

REVISION TIMETABLE • Plan all 25 HKDSE subjects, not just Maths — official names, papers and topics • Drag to build your week; clashes nudge to the nearest free slot • Revision, test, mock and homework blocks, each with an optional reminder • "Build my week" fills your free hours around what is already there • A Progress tab tracks what you have mastered

STAY ON TRACK • Home Screen widgets: your practice streak and grade trend, a live HKDSE countdown, or today's revision plan, right on your iPad Home Screen — each keeps itself up to date, so you see where you stand without opening the app • Inside the app: the same countdown, streak and grade-trend chart on your home tab, plus an optional evening study reminder so the streak never breaks • Every attempt saved with full per-topic history — watch your progress build

FREE TOOLS (no login needed) • HKDSE cutoff scores: 16 subjects, every year since 2012, in interactive charts • Past-paper solutions and complete illustrated revision notes, natively typeset • Guest mode: answer your first question 30 seconds after downloading

FAIR PRICING • 80 free tokens every month, on every account — the free tier is real • Top-up token packs that never expire • Plus, Pro and Max plans cost a fraction of one tutoring lesson

The whole app is bilingual — switch between English and Traditional Chinese any time.

Built by Hong Kong DSE Maths teachers. Download free and start working towards your 5** today.

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