This website stores your name and email address in a database. It also keeps a record of your payment amount, date of payment and amount of payments. It does not keep any bank details or contact information, other than your email address.
The reason this information is stored is to provide you with a useful record of your driving lessons (amount, cost etc) and to send you homework.
This information will not be shared with third parties and will be removed from the database either at your request or at the end of the year in which you finish taking lessons.