# Crestellar Academy — Mock exams · past papers · 5** > Mock exams · past papers · 5** (iPhone/iPad app by Crestellar Academy Limited.) - Source: https://appshunter.io/ios/app/crestellar-academy/id6670178477 (this page in markdown: same URL + `.md`) - Developer: [Crestellar Academy Limited](https://appshunter.io/developer/1765192168) - Category: Education - Price: Free with in-app purchases - Age rating: 12+ - Requires: iOS 18.6 · 68 MB - Languages: American English, Chinese (Traditional, Taiwan) - Released: 2025-11-24 - Data updated: 2026-09-20 - User reviews in markdown: https://appshunter.io/ios/app/crestellar-academy/id6670178477/reviews.md ## What is Crestellar Academy? The all-in-one HKDSE Maths self-study app for iPhone and iPad — real 名校 exam questions, timed mock exams, past-paper solutions, revision notes, and every subject's 5** cutoff since 2012. Free to start, no account needed. NOW ON iPHONE • The whole app on your phone: quizzes, mock exams, long questions, past papers, notes, the timetable and Home Screen widgets, laid out for a phone — one account, one subscription, both devices • Writing on the question stays iPad-only for now 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, per-topic time and accuracy • DSE LEVEL PREDICTOR: your mock score is converted using the REAL cut-offs from the last five years of HKDSE Mathematics — see where you sit and how many more questions reach the next level. • One-tap drill on your weakest topic • Long-question sessions: 5–50 per session, unseen questions first • Save questions to revisit; share a result card in one tap 5** SOLUTIONS • Every question has 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 (iPad) • In a timed quiz, the Long Question bank or any saved question: pen, dotted pen, highlighter and eraser, pinned to the figure so they scroll and zoom with it — or pull up a blank scratch sheet • Hold at the end of a stroke and it snaps perfect — lines, circles, rectangles, triangles, parabolas — then drag its corners; one undo puts your freehand back • Apple Pencil always draws and double-tap swaps to the eraser; workings are never stored VISUAL MATH LAB • 43 interactive topics across three papers — Compulsory Part (21 labs), M1 Calculus & Statistics (12 labs: exponential growth, maxima & minima, trapezoidal rule, Bayes' theorem, random variables, binomial/geometric/Poisson, normal distribution, Central Limit Theorem, confidence intervals and 3 shared) and M2 Algebra & Calculus (13 labs: linear systems, matrices, vectors, limits, curve sketching, related rates, integrals, volumes, trig identities, binomial theorem, induction) — drag real DSE figures, watch the maths respond • Every lab runs on iPhone and iPad; AM–GM, Circle Angle Theorems, M2 Systems of Linear Equations and M1 Central Limit Theorem are free with no account; the rest are free to read — upgrade to interact REVISION TIMETABLE • Plan all 25 HKDSE subjects — official names, papers and topics; drag to build your week, clashes nudge to the nearest free slot • Revision, test, mock and homework blocks with optional reminders; "Build my week" fills your free hours; a Progress tab tracks mastery STAY ON TRACK • Home Screen widgets on iPhone and iPad: your practice streak and grade trend, a live HKDSE countdown, or today's revision plan • In the app: the same countdown, streak and grade trend, plus an optional evening study reminder • Every attempt saved with full per-topic history 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: 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 Fully bilingual — switch between English and Traditional Chinese any time. Built by Hong Kong DSE Maths teachers. Download free and aim for your 5**. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.crestellaracademy.com/privacy-policy ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Plus | $4.99 | per month | | Plus | $49.99 | per year | | Pro | $9.99 | per month | | Pro | $99.99 | per year | | Max 5x | $14.99 | per month | | Max 5x | $149.99 | per year | | Max 20x | $34.99 | per month | | Max 20x | $299.99 | per year | **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | 500 Tokens | $5.99 | one-time | | 2,000 Tokens | $19.99 | one-time | ## Version history (last 5 releases) ### 4.1 — 2026-09-12 VISUAL MATH LAB — M1 AND M2 START HERE • The Lab now opens on a subject picker: Compulsory Part (21 labs, 6 strands), M1 Calculus & Statistics (12 labs, 3 strands) and M2 Algebra & Calculus (13 labs, every strand). • Nine new M1 labs: Exponential Growth & Decay (equal times multiply by equal factors), Maxima & Minima (where f′ changes sign the curve turns — and the end points can win), The Trapezoidal Rule (equal strips, and concavity says over or under), Bayes' Theorem (turn P(A | B) around, and watch the base rate decide), Discrete Random Variables (where the bars balance, and how far they spread), Binomial, Geometric & Poisson (three ways to count — and when each one fits), The Normal Distribution (every normal curve is the standard one, rescaled), The Central Limit Theorem (sample means from any population pile into a bell) and Confidence Intervals (most intervals catch μ — you never know which ones); M1 also lists the Exponential ↔ Logarithm, Related Rates and Indefinite Integration labs it shares with the other papers. • Thirteen new M2 labs: Systems of Linear Equations (watch three planes meet at a point, a line, or nothing), Matrices & Determinants (the determinant IS the area factor), Volumes of Revolution (spin the region, slice it, stack the discs), Vectors in Space (the dot product, the cross product, and the volume they span), Limits & the Derivative (let h shrink and the secant becomes the tangent), Trigonometric Identities (two waves in, one wave out), Indefinite Integration (+ C is a whole family of curves, not one), The Binomial Theorem (one row of Pascal, every term at once), Mathematical Induction (turn the base case off and the entire ladder goes dark), First Principles & Named Limits (squeeze sin θ/θ to 1, then find the base whose slope at 0 is exactly 1), Curve Sketching (slide a parameter and watch two turning points merge), Related Rates (a steady rate in, a changing rate out) and Definite Integral Properties (areas that cancel, split and reflect). • M2 Systems of Linear Equations and M1 The Central Limit Theorem are completely free — no account needed. • Fixed: the formula box no longer flickers its height when you tap a question-type number. ### 4.0.1 — 2026-09-07 VISUAL MATH LAB — NOW ON iPHONE • All 21 interactive topics now run on iPhone. Drag the figure, move the angle, push a point, and the maths responds live. • AM-GM and Circle Angle Theorems are free with no account; read every other lab free and upgrade to Max to drag them yourself. • The orange card in a revision note opens that chapter's lab in one tap, on your phone too. ### 4.0 — 2026-09-05 NEW — NOW ON iPHONE • Crestellar Academy runs on your iPhone: practice quizzes, timed mock exams, the Long Question bank, past-paper solutions, revision notes, HKDSE cutoffs, the Revision Timetable and the calculator programs, each laid out for a phone screen. • One account, one subscription, both devices (signed in on one at a time). • All three Home Screen widgets — streak & grade trend, the HKDSE countdown and today's plan — on iPhone too. • Writing on the question and the Visual Math Lab stay iPad-only for now; they follow in a later update. FIXES • Quiz Ink undo: dotted lines, highlighter strokes and everything drawn before a shape snapped can now be undone, and redo is back. • Revision Timetable: the subject row scrolls again, and dragging a session in portrait lands on the day you meant. • Timetable topic names now show in their own subject's language. • A handful of graph questions no longer open as a blank card. ### 3.3.3 — 2026-08-26 NEW — WRITE ON THE QUESTION • Work out your answer on the question itself during a timed quiz: pen, dotted pen, highlighter and eraser, with your workings pinned to the figure so they scroll and zoom with it. • Hold still at the end of a stroke and it snaps perfect — lines, circles, ellipses, rectangles, squares, triangles, polygons and parabolas — even from a rough sketch whose ends never met. • Then drag its corners and endpoints to adjust it, and a dragged point clicks onto a neighbouring shape's corner so your construction joins up. One undo puts your freehand back. • A selection tool picks up part of your working to move, resize or rotate it. • Four pen colours, four highlighter colours with an adjustable width, and an eraser that takes a whole stroke or just the part you rub out. • Apple Pencil always draws; double-tap swaps to the eraser, squeeze holds it, and you can set it so only the Pencil writes while your hand rests on the screen. • Works in the Long Question bank and on your saved questions too — English and Chinese each keep their own workings. • Need more room? Pull a blank sheet of scratch paper up from the bottom of the question — drag it to whatever height you like, keep the question in view above it, and every question keeps its own sheet. • Nothing is ever stored: your workings never leave your iPad. POLISH • Full-screen everywhere — the answer sheet and the question preview now hide the status bar like every other page. ### 3.3.2 — 2026-08-22 NEW — REVISION TIMETABLE • Plan every HKDSE subject, not just Maths — 25 subjects with official names, paper splits and topic lists. • Build your week by dragging; a clash nudges to the nearest free slot and tells you where it went. Revision, test, mock exam and homework blocks, each with an optional reminder. • "Build my week" fills your free hours around whatever is already there, weighted by your subject priorities. • A Progress tab tracks what you have mastered topic by topic, and Maths sessions deep-link straight into the revision notes and mock exams. • A third Home Screen widget shows today's plan, right on your iPad Home Screen. POLISH • The app now runs true full-screen, for a cleaner look on every page. ## Apps similar to Crestellar Academy | App | Rating | Price | Category | | --- | --- | --- | --- | | [Calcable - DSE Calculator](https://appshunter.io/ios/app/calcable-dse-calculator/id6782670288) | — | Free | Education | | [iStudy Staff](https://appshunter.io/ios/app/istudy-staff/id1581705809) | — | Free | Education | | [TY Maths](https://appshunter.io/ios/app/ty-maths/id6776310581) | — | Free | Education | | [Grade Vault](https://appshunter.io/ios/app/grade-vault/id6739982273) | 5.0 (4) | Free | Education | | [Errolux DSE數學錯題簿 - 操卷溫習筆記](https://appshunter.io/ios/app/errolux-dse/id6754518544) | — | Free | Education | | [DSE Physics Master 物理神器](https://appshunter.io/ios/app/dse-physics-master/id6781737430) | — | Free | Education | ## Related topics [hkdse 中文精讀筆記](https://appshunter.io/ios/topics/hkdse-中文精讀筆記) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-20.*