Since you are on a non-commitment package you can cancel your subscription anytime.
If you wish to cancel you can do so under My Account : Billing & Features. Your subscription will be cancelled the day before your next billing date.
We are very sad to see you go and hope to see you back in the school soon!
In case you change your mind: You can always undo your cancellation on My Account : Billing & Features by clicking "Restart Course".