How significant was your first test in terms of the pass/fail boundary?
Driving (at least in the UK) is one of the most hazardous activities you will ever engage in. And you will likely be doing many hours of a year for the remainder of your life. It is therefore not really in your best interests to be passing first time or doing so narrowly.
Anyway, putting that to one side, you can relax with your driving test a bit. Because you always have the option of trying again there is no pressure.
Just logically go through each manoeuvre and ensure you use indicators and mirrors as appropriate.
The heavier the traffic, the better for you because there will be more time spent waiting and less emphasis on you being at the appropriate speed- just stay in tune with the rest of the traffic.