Just completed the PPL Checkride yesterday, and my best tip is this...
Make a note of the correct power setting for airspeed 100 and make sure you hit it as soon as you level out, then trim as soon as possible before the first turn. You don't get a lot of time to trim but it makes it a lot easier to hold the speed during the turns if you get that right.
Also, once you have completed the turns make sure you listen to the instructions when approaching the runway, you get quite an interesting speech from the examiner if you make the same silly mistake that I did
Good Luck, stick with it