sorry to reply you late. the fee for semi-private(3-4 students) is HK$650 on Monday to Friday, HK$700 on Saturday. Most likely Friday to Saturday are fully booking.
My daughter now is learning on Saturday semi-private 11:30am $700 for 5 lessions.
If you really interested in it. You can reserve the skating school with the coach you want. Let them call you or you can ask them to give you the coach mobile no.