I had one before mine, the day before my test, just to get used to the car again. I failed the first with four minors and a major, and passed the second with four minors.
I didn't want anymore practice because I knew I failed on something silly and didn't think any more lessons would have helped me.
If you think you know what you did wrong and can keep it in mind for next time and pass, only have enough to keep you from going rusty. If you think you need more practice, forget about the test for now, have another lesson, and rethink when you will need to be booking a test.