Several ordinary tasks share one clock. The free run is two tasks for 45 seconds. Paid runs add a code and bring the next card sooner, which is the part people drop.
Write down the panel you skipped, not the score alone. Most misses are a gauge that went red while you were still typing a sum, or a code you rehearsed and then failed to type when asked. The next session, protect that panel first. One focused repeat beats five rushed ones.
Practice past the free drill
One free drill in each family stays free. Paid drills are the harder variants.
An answer that matches and arrives before that card disappears. A right sum after the card has gone is not scored. The free drill uses sums and a gauge for 45 seconds. Paid drills add a code to remember and shorten the gaps.
The one that is about to expire. The drill is built so the gap between new cards shrinks on the paid rising-load variant. If you finish your favourite panel and ignore the gauge, the score shows it.
No. Those are EUROCONTROL work samples with their own rules, and they are not published as a practice copy. This is a plain load: arithmetic, a watch item, and a two-digit code.