Your account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal.
Subscriptions may be managed and auto-renewal may be turned off by going to your iTunes Account Settings after purchase.
Payment for subscriptions will be charged to your iTunes Account at confirmation of purchase.
Subscriptions are automatically renewed unless auto-renew is turned off at least 24-hours before the end of the current period.
Compare your time delayed video to a looping video of an expert, so that you see the differences in real time and accelerate your learning.