The calendar is the product
Families count weeks, not leads
A parent who calls in October is not a generic enquiry. They are preparing for a named sitting, and everything about the conversation is shaped by how many weeks remain: whether a full course still fits, whether a shorter package makes more sense, whether the honest advice is to target the next date instead. A CRM organized by enquiry date cannot have that conversation with them. One organized by test date can.
Cohorts make demand forecastable
Grouping families by the sitting they are preparing for turns a stream of leads into a set of cohorts with known deadlines. You can see how many seats each cohort needs, when its enquiry window closes, and whether it is tracking ahead of or behind the same cohort last year — which is the difference between staffing to a plan and staffing to a hunch.