It is difficult to gauge initially how many lessons you may need. The driving tests now are more demanding than ever and a high degree of skill is needed to pass the tests. If you were to ask many of the larger driving institutions and national driving schools then a recommended amount would be approximately 30-40 hours tuition for a 17 yr old pupil. Some people learn much more quickly and some people take more time and lessons to reach an acceptable standard. After a few lessons your instructor should be able to give you a fair indication.