The all-in-one DSE Maths self-study app 一App搞掂DSE數學
Real 名校 exam questions, timed mock exams, natively-typeset past-paper solutions, revision notes, and every subject's 5** cutoff since 2012. 名校試題、計時模擬試、歷屆試題詳解、溫習筆記、2012年起各科5**分數線。
Everything inside the appApp入面嘅所有功能
Eight tools, one app — from first practice question to results-day cutoff check. 八大功能，一App齊晒 — 由第一條練習題操到放榜睇分數線。
MCQ practice quizzes & timed mock examsMCQ練習同計時Mock卷
Choose exactly what to drill — form (S1–S6), topic, sub-topic and difficulty — or sit a full timed mock exam blueprinted on the real HKDSE Paper 2. The wall-clock timer keeps exam pressure honest, you can flag questions to revisit before submitting, and challenge mode serves the toughest beyond-syllabus problems. 自選年級（S1–S6）、課題、子課題同深淺操卷，或者直接考一份跟足HKDSE卷二藍圖嘅計時Mock卷。計時器跟足真考試節奏，唔肯定嘅題目可以先標記、交卷前再返轉頭做，仲有挑戰模式俾你操超綱難題。
Instant marking, estimated level, deep analysis即批、估等級、深入分析
Submit and the result is ready instantly: an estimated DSE level with a score ring, the full answer sheet showing exactly where you slipped, model answers for every question, time-and-accuracy charts by topic, and a one-tap drill on your weakest topic. Every attempt is saved to Quiz Records, and a branded result card is ready to share with classmates. 一交卷即刻有結果：估算DSE等級同分數環、逐題答案紙睇清楚邊度失分、每題model answer、逐課題時間同準確度圖表，仲可以一掣操弱項。每次紀錄自動保存喺Quiz Records，成績卡仲可以即刻分享俾同學。
Real 名校 Long Question Bank名校長題目題庫
A deep bank of long questions in the real exam format, organised by topic, sub-topic and difficulty, in English and Chinese. Read the question, attempt it on paper, then flip to the full marking-scheme solution — natively typeset, razor-sharp at any zoom, with pinch-to-zoom for the fine print. 大量真考試格式嘅名校長題目，按課題、子課題、深淺分類，中英對照。睇題、落筆做，再翻去完整marking scheme解答 — 原生排版，放大幾多倍都清晰。
Advanced Solutions — beyond the marking scheme進階解法，唔止標準答案
Max plans unlock a second solution for every question: the faster 5** method — clever setups, time-saving techniques and calculator-program shortcuts, with common traps called out before you fall into them. Standard marking-scheme solutions remain on every paid plan. Max計劃每題解鎖多一份解法：5**快速做法 — 聰明設題、慳時間技巧、計數機program捷徑，仲會預先提你常見陷阱。標準marking scheme解答就每個付費計劃都有。
Complete notes + Typical Questions & Skills全課題筆記連題型攻略
Natively typeset revision notes for every syllabus topic — definitions, formulas, worked examples, common-mistake callouts and proper figures. Max plans add Typical Questions & Skills: every exam question type across 19 chapters, walked through step by step the exam-script way. 全課題原生排版筆記 — 定義、公式、例題、常見錯誤提示同精美插圖。Max計劃再加題型攻略：19章每一種考試題型，一步一步exam-script式教你做。
Past-paper solutions, beautifully retypeset歷屆試題詳解，全新排版
HKEAA marking schemes rebuilt natively — no blurry scans: Paper 1 solutions question by question with marks and remarks, the full Paper 2 answer key with answer rates, the general marking guidelines, and highlights from the examiners' report. HKEAA評卷參考原生重排 — 唔係模糊影印本：卷一逐題詳解連分數同註解、卷二全份答案連答對率、評卷總則，仲有考試報告重點。
HKDSE Cutoff — every subject since 2012HKDSE分數線 — 2012年起每一科
Level cutoffs from 5** down to 2 for 16 subjects, 2012–2025, as a clean table and an interactive chart — percentage headline with the raw threshold underneath. Completely free, no login, updated every results day. 16科由2012到2025年嘅等級分數線（5**至2），一表一互動圖 — 百分比做主角、原始分數喺下面。完全免費、唔使login，每年放榜日更新。
Calculator programs that save whole minutes計數機Program，一分一秒都慳
Step-by-step input guides for fx-50FH II calculator programs — quadratic equations, circle equations, loci and more — plus demos showing exactly when to fire each program inside a real exam question. fx-50FH II計數機program逐步輸入教學 — 二次方程、圓方程、軌跡等等 — 連示範教你喺真題入面幾時用邊個program最著數。
Simple plans, honest free tier收費簡單，免費都好用
Every plan unlocks the same app — plans differ in monthly ⚡ tokens and solution depth. Prices are what the App Store charges in Hong Kong. 所有計劃都係同一個App — 分別在於每月⚡token數量同解答深度。價錢即係香港App Store收費。
- Guest mode — try before you even sign up訪客模式 — 唔使開戶口都試到
- 80 ⚡ tokens every month for practice每月80個⚡token做練習
- HKDSE Cutoff — 16 subjects, no login neededHKDSE分數線 — 16科，唔使login
- Past-paper solutions & complete revision notes歷屆試題詳解同全課題溫習筆記
- Quiz records & saved questions試後紀錄同收藏題目
- Everything in FreeFree全部功能
- Full Long Question bank with marking-scheme solutions全長題目題庫連marking scheme解答
- MCQ practice quizzes with instant markingMCQ練習即做即批
- S1–S6 mock exams on the real Paper 2 blueprintS1–S6跟真卷藍圖嘅Mock卷
- Per-topic exam analysis & weakest-topic drills逐課題成績分析同弱項特訓
- Calculator programs (Plus / Pro)計數機Program（Plus / Pro）
- Everything in PlusPlus全部功能
- 3× the tokens — enough for daily practice3倍token — 日日操都夠用
- Everything in ProPro全部功能
- Advanced 5** solutions on every question每題5**進階解法
- Typical Questions & Skills — all 19 chapters題型攻略 — 全19章
- Max calculator programsMax計數機Program
- Early access to new features新功能早鳥試用
- Everything in Max 5×Max 5×全部功能
- 4× the tokens — practice without counting4倍token — 操到唔使數住用
- Built for the final sprint to the exam為考前衝刺而設
⚡ Token top-up packs are also available inside the app. Subscriptions are billed and managed through your Apple ID; monthly ⚡ token allowances are identical on monthly and annual billing. App內另有⚡token加購包。訂閱經Apple ID收費同管理；無論月費定年費，每月⚡token數量一樣。
Frequently asked questions常見問題
What is Crestellar Academy?Crestellar Academy係咩？
Does it cover the Compulsory Part of HKDSE Mathematics?係咪包HKDSE數學必修部分？
What resources are on Crestellar Academy?App入面有咩資源？
- Long Question Bank — extensive HKDSE-style long questions by topic, sub-topic and difficulty, each with a full marking-scheme solution (and an advanced solution on Max)長題目題庫 — 大量HKDSE式長題目，按課題、子課題、深淺分類，每題連完整marking scheme解答（Max再有進階解法）
- MCQ Practice Quizzes — timed quizzes across every topic and difficulty, with instant feedbackMCQ練習 — 覆蓋每個課題同深淺嘅計時測驗，即做即批
- Mock Exams — simulated S1–S6 papers on the real Paper 2 blueprint, for readiness and time managementMock卷 — S1–S6跟足真卷二藍圖嘅模擬試，練實力又練時間分配
- Past-paper solutions — HKEAA marking schemes natively retypeset, with the Paper 2 answer key and examiners' report highlights歷屆試題詳解 — HKEAA評卷參考原生重排，連卷二答案同考試報告重點
- Revision notes — complete natively-typeset notes, plus Typical Questions & Skills on Max溫習筆記 — 全課題原生排版筆記，Max再加題型攻略
- HKDSE Cutoff — level cutoffs for 16 subjects since 2012, free for everyoneHKDSE分數線 — 16科由2012年起嘅等級分數線，人人免費
- Calculator Programs — beginner-friendly guides for entering and using each program effectively計數機Program — 新手都跟到嘅輸入同應用教學
- Full English and Traditional Chinese interface全英文／繁體中文介面
Is it really free to start?真係免費開始？
What are ⚡ tokens?⚡Token係咩？
What's the difference between Plus, Pro and Max?Plus、Pro、Max有咩分別？
Why is it better than textbooks and supplementary exercises?點解好過教科書同補充練習？
Can I be logged in on multiple devices?可唔可以幾部機同時login？
Which devices does it run on?支援咩裝置？
What currency are the prices in?價錢用咩貨幣？
Using iPhone?用緊iPhone？
Crestellar Academy is an iPad app today — the iPhone version is on the way. Leave your email and you'll be the first to know the moment it ships. Crestellar Academy而家係iPad App — iPhone版整緊。留低email，一出你就第一時間收到通知。