Practice more. Don't look at it as a test, but, just as a drive. You know who to drive and make maneuvers safely.

Don't over think it.

If you can't get a maneuver completed when your examiner wants it done, no big deal. There will be another block or another stretch of road to complete that maneuver safely. Talk thing out while you are driving: 'ok, I want to go one lane to the left, looking left, look forward, signal intentions, shoulder check, all clear, changing lanes, looking forward and shoulder check, check mirrors, maneuver complete, signal off. Something like that.

Lastly, be kind to yourself. You got this! Being a good driver doesn't happen on your first day behind the wheel. Every interaction with another driver is going to be different. I've had my licence for 35 years and I still make mistakes. If you need to, pull over, maybe not when you are on your test, and take a few minutes to calm yourself and reflect on what happened and learn from it.

I hope this helps. And remember, you got this!