First up you should speak with your instructor to ensure that you choose a date when their vehicle is available for you to use. A lot of learners find themselves in a pickle because they've booked a test date that their instructor can't accomodate!
Unless otherwise agreed with your instructor, test day hire will include pick up an hour before the test, an hour for the test and de-brief and travel to and from the test centre. Instructors may also charge an additional car-hire charge
Unfortunately we can't get involved in the booking of your practical test - you'll have to contact the DVSA about that yourself. Head to their website and book a test slot that both you and your instructor are available for.