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O Level · IGCSE · A Level

Don’t just read the chapter. Work it out.

Interactive lessons for Cambridge and Edexcel syllabuses. You predict, drag and answer every minute or so, get feedback on the exact mistake you made, and see why when it does not click.

  • First chapters free
  • 1,000 taka a course
  • Works on a phone

02Percentage change

One multiplication

Eid sale: a 2,000 taka panjabi is 30% off. What do you pay?

You pay
1,600
You save
400
0.80=1−0.20\htmlClass{lesson-term lesson-term-mult lesson-color-violet}{0.80} = 1 - \htmlClass{lesson-term lesson-term-fall lesson-color-red}{0.20}2,000×0.80=1,600\htmlClass{lesson-term lesson-term-base lesson-color-blue}{2{,}000} \times \htmlClass{lesson-term lesson-term-mult lesson-color-violet}{0.80} = \htmlClass{lesson-term lesson-term-result lesson-color-green}{1{,}600}

Set the sale

Drag the discount until it reads 30%, and watch what you pay.

Eid sale: a 2,000 taka panjabi is 30% off. What do you pay?

01How a lesson works

Every lesson asks you to do something

About ten minutes a lesson, and you are doing something every minute or so.

  1. 01

    Predict

    Guess before you are told. A prediction, right or wrong, makes the answer stick.

  2. 02

    Drag

    Move a value and watch the diagram, the numbers and the formula change together.

  3. 03

    Feedback

    A wrong answer gets feedback written for that mistake, with the marks an examiner would give.

  4. 04

    Show me why

    Tap Show me why and the lesson replays the part that explains it, with your own numbers.

02Smart Coaching

For coaching centres: teach tomorrow what they missed tonight

Set a lesson before class. By the morning you know who finished, which questions the class missed and why. Then you teach exactly that.

  1. 1Assign tonightPick a lesson, set a due date and share one link with the class.
  2. 2See the misconceptionsEvery answer is marked. The report groups the mistakes into misconceptions.
  3. 3Reteach tomorrowOpen the next-day plan and present only the parts the class got wrong.
Teacher sign inHow centres join

Percentage change

O Level Batch B

Due Thursday
18/ 22finished

Top misconceptions

  1. 1Divided the change by the new price7 studentsReteach: step 4
  2. 2Mixed up percentage points and per cent4 studentsReteach: step 3
  3. 3Added two changes instead of multiplying3 studentsReteach: step 6
Tomorrow’s planOpen on step 4 and present the weak parts first.

03Courses

Pick a course, open a chapter

Start with the free chapters. Buy a course when you want the rest of it.

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04Pricing

One course, one payment

One price for a course, paid once. No subscription to forget about.

For students

Per student

1,000taka

per course, paid once with bKash
  • The first chapters of every course, free
  • Every lesson, with feedback and Show me why
  • Notes and progress that follow you
  • Pay once with bKash
Start free

For coaching centres

Per student

1,000taka

per course, for each student you enrol
  • Classes and students set up with you
  • Assign lessons with a due date and a share link
  • A class report of misconceptions
  • A next-day plan, ready to present
How centres join

05Questions

Before you ask

Does this replace school or coaching?

No, it sits beside them. Use it before a class to meet a topic, or after one to make it stick. Your teacher can also set lessons for your class.

How much does it cost?

The first chapters of every course are free. The rest of a course is about 1,000 taka, paid once with bKash. Each course shows its exact price before you pay.

Are you part of Cambridge or Edexcel?

No. Chapterly is independent. We name Cambridge and Edexcel only so you know which syllabus a course follows.

Who writes the lessons?

Every lesson is written by a tutor and approved by a second tutor before any student sees it.

Do I need a laptop?

No. Lessons run in the browser on a phone, a tablet or a laptop, and pick up where you left off.

How does a coaching centre start?

During the pilot our team sets up each centre’s classes, teachers and students with you, under a yearly agreement. Teachers then sign in and assign lessons themselves.

Open your first chapter today

The first chapters of every course are free to open. Nothing to pay, nothing to cancel.