General Terms -
Regular sessions are paid monthly subscription style in return for (e.g) 4 ~2 HR sessions (expected to be taken weekly ) - a missed scheduled session can be rescheduled as a 'catch-up' ( unlike many tutoring agreements where paid sessions are simpy lost if missed )
Catch-ups require both parties to organise and take them as soon as is practical, and as such do not 'accrue' beyond 2 catch-ups (circumstances not withstanding) - this is to provide maximum fairness for both parties, maintains predictability & positively aligns incentives for all.
If ending a subscription, 2 weeks notice is required prior to the next month billing date in order to avoid the next scheduled payment being the last.