Looking for a plugin allowing bookings of preschool session

Hi,

I have started a business that is essentially term based sessions that have a limited number of places for each session.
The term start dates vary and they run for varying lengths. Each day in a week has a different session and session time. So it would look something like this

Term 1 2016
– Full Term Tuesday Morning Session
– 8 Places
– Full Term Tuesday Afternoon session
– 8 Places
– Full Term Thursday Morning Session
– 8 Places
– Full Term Thursday Afternoon session
– 8 Places
– Full Term Friday Morning Session
– 8 place
and so on.

So each of those sessions can be booked separately to a maximum of 8 people, or n people configured by me.

I purchased woobooking and woocommerce but I am unable to configure a part of it as I need.

The price of booking depends on how many sessions you book. So if you were to book the Term 1 and book for a single session the price is $17, if you book fro 4 sessions in the term you pay $15 per session and if you book for the full term you pay $12 per session.

I just havent been able to find a way to do this within woobookings or any other system.

Just wondering if anyone has any thoughts on either how to achieve this in woobookings or in any other options I could use?

Regards
Dan