Limits of the model
The curve is built on the northern hemisphere and tied to a school calendar that starts in September. On other markets it shifts.
MENA. The cycle moves by roughly one month. In practice that means a different schedule: prepare in August, open in September, full growth from October. Ramadan needs to be planned separately. Its dates move about 11 days earlier every year, so it cannot be pinned to a month: in 2026 Ramadan fell across February and March, and it will keep shifting earlier in the years ahead. It currently overlaps the period that produces the peak in Europe, which means the March peak does not hold in MENA in its usual form. The dip in activity during Ramadan is planned in advance, together with the schedule and the marketing budget, rather than absorbed after the fact.
Latin America. Some countries run an August to September school calendar and others run a February one. Both appear in the network, sometimes within the same region. On a February-start market the curve inverts, which also opens a second window for launching, and the intake has to be planned across two cycles instead of one.
We publish the northern hemisphere curve as the baseline. The curve for a specific market is recalculated together with the partner, based on the calendar of their school year.