BEagle's right. We're not looking for perfection, just safe flying - hell, if I had a penny for every mistake I'd made I wouldn't be examining for a living!
If you're instructor puts you up for test, then you're good and ready. So take your time and enjoy it.
We're examined too you know, so we know exactly how you feel - and that most of us only fly to 75% ability under test. Be safe and get your ticket.
Oh, and a beer at the end of the day often helps smooth the passage of paperwork! Good luck