You do not know a thing until you can say it out loud.
Explain what you studied, out loud, one take. Then see what you understood and how you said it.
Compound interest means the interest you have already earned starts earning interest too, so the balance grows faster the longer you leave it alone. Um, and that is why starting early matters more than the rate.
- CoveredInterest is paid on the interest already earned
- MissedMore frequent compounding raises the effective annual rate
- Measured93.9 words per minute, one filler word
How compound interest grows
Assigned. There is no menu on this screen and nothing to browse.
One step at a time
You are assigned today's step. You do not choose it and there is nothing to browse — picking is procrastination wearing a productive face.
- A worked example, with the arithmetic shown
- A short reading on effective annual rates
The questions stay hidden until you say you are ready.
Study until you say so
Curated material, no countdown. You read for as long as you need, and the questions stay hidden until you choose to begin — so what gets tested is the understanding you built, not the answers you drafted.
Question 2 of 3 — explain how compounding frequency changes the outcome
Three seconds of count-in, then one take. No re-record.
Say it out loud, one take
Three questions: two ask you to explain the idea, one drops you into a situation and asks what you would do. Each answer is one take, no re-record, with a three-second count-in so the first thing captured is the first thing you meant to say.
- CoveredInterest is paid on the interest already earned
- MissedMore frequent compounding raises the effective annual rate
- Measured93.9 words per minute, one filler word, longest pause 1.8s
Honest about what came back
Your explanation is checked against the key points of the step — which you covered, which you missed, and anything you said that was wrong. Being confident and incorrect comes back worse than being brief and right. Speaking pace, filler words and long pauses are measured, not estimated — counted from your transcript the same way every time, so 93.9 words per minute today and 93.9 next week mean the same thing.
Why only one take per answer
Because the second take is a different skill. Re-recording until it sounds right turns a fluency drill into an editing exercise, and editing is not what fails you in a standup, an interview, or a design review. The constraint is the product.
An early product, built in the open. Tell us what you want to learn; subjects are built from public sources, and the catalogue is small and growing.