Trial class: before the class at the time of booking.
Packages:
If it is your first package, before the first class of this package at the time of booking.
If it is your subsequent package, by 8th day of each 1/2/3-month period.
Trial class: before the class at the time of booking.
Packages:
If it is your first package, before the first class of this package at the time of booking.
If it is your subsequent package, by 8th day of each 1/2/3-month period.
EN 
PL