California preschool says we are liable for the entire year''s tuition to withdraw our child 3 months before school year begins.

Our child is currently enrolled in a private preschool in Northern CA. In March 2012, we made a mistake of signing the re-enrollment form for the upcoming school year (beginning in Sep. 2012) without carefully reading through the contents. (No excuse here) However, due to recent change in our finance, it became very necessary to send our child to a full day facility (the current one only offers half day). This prompted us to look for a withdrawal policy, only to find that there is basically none. We are liable to pay the entire year''s tuition (~$8K) for withdrawal after April 2012 for any reason. Local child care council says this is completely unheard of. Is there any chance this portion of the contract might be considered unconscionable, or against a local regulation? Thank you!