Day 77 has closed

Each day's set stays open for 72 hours: the day it lands, plus the two days after. After that it closes.

We close it on purpose. Sets that stay open pile up into a backlog, and a backlog you cannot realistically clear is the thing that quietly makes people give up. One day at a time keeps this finishable.

Nothing is taken away when a day closes. Every one of its questions stays in the question bank, and its topics stay open to read and practise whenever you want.