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A note for every topic, questions that explain every answer, mock papers and a plan that runs to your exam day. For the IB Diploma, AP and the SAT, with no fees and no adverts.
Which of the following is a leakage from the circular flow of income?
A leakage is income that leaves the flow between households and firms: saving, taxes and spending on imports. A and D are the opposite, injections that add spending. C is the flow itself: factor income paid from firms to households.
topic notes across the IB, AP and the SAT
questions, each one explained
mock papers with mark schemes
for a student, now and later
One page per topic.
Every topic of the syllabus has its own note, written from the official subject guide. Diagrams are drawn for the page, and every note points out the mistakes that cost students marks.
The end of each note checks you before you move on: tick off what you can now do, answer one question, then try the exam-style ones with their mark scheme.
We know buyers respond to price, but by how much?
- Calculate PED from data
- Link PED to total revenue
Four ways to practise.
Every question is written for Educerie and marked the moment you answer. The explanation covers the wrong options too, because each one is written to catch a particular mistake.
Rapid round
Ten, twenty or thirty questions on a subject, or only the topics you pick.
Comeback
Miss a question, or get it right on a guess, and it comes back the next day, then after three days, then after a week.
Trap drill
A short round built on the mistakes that catch you most often.
Written
Exam-style long answers in every subject, marked by you against the mark scheme, point by point.
Every day, up to the exam.
Add your subjects and the plan fills in the IB exam dates from the official timetable; for the SAT you pick your sitting. It spreads every topic over the days you study, so you know what to do today and what's left.
A topic you learn comes back three times, on questions you haven't answered yet. The final weeks revise your weakest topics first.
Mon
Learn · Econ 2.8Review · Bio A1.1Tue
Learn · Maths 1.3Wed
Review · Econ 2.8Learn · SAT ALG.2Thu
Learn · Bio A2.3Fri
Review · Maths 1.3Sat
Topic check · Maths topic 1Sun
Mixed set · 10 questionsMock exams
210 full papers in the current format, ten of every paper in Biology, Chemistry, Physics, Maths AA and Economics, each with its mark scheme. Mark one beside the paper and see an estimated grade from 1 to 7.
Start free to sit oneFor teachers
Open a class with one code, set notes, practice and written questions with due dates, and see who is keeping up and which topics the class gets wrong. Free for teachers until Q3 2028.
For teachersQuestions
Who writes the notes and questions?
We do, from the IB subject guides and the College Board's SAT framework. Nothing is copied from past papers, which belong to the IB and the College Board.
Do I need an account?
Yes, a free one. It keeps your notes, progress and plan with you on every device.
My school teaches the topics in a different order.
Mark the notes you've already done as read. The plan counts them as learned and schedules their reviews, and lays out the rest in syllabus order.
Can I do the IB or AP and the SAT together?
Yes. They all go into one plan, each paced to its own exam date.
Write to us
A question, a mistake in a note, a topic you want covered, or a school partnership. It comes to us at [email protected] and we answer by email.
Start with the topic
you're on at school.
Open its note, tick what you know, answer the question at the end.