You have to fill out a log book. Each time you drive, how long you drove for, if it was dry/wet, day or night, the kilometers before and after you drive, the registration number of the car and the phone number of the instructor at the time, if it was mum, dad or whoever.
Before you can go for your driving test you hand the log book in and they go over it for a minute or so.
yea its good when they are harsh on you in the lessons and tell you off, because it keeps you in line. otherwise you'll be shocked when you find out the mistakes you make in the actual test.