Passing your test is only a beginning, it allows you to go out on your own and to start really learning how to ride and there is still a lot for you to learn
The first thing is to get miles of practice under your wheels so that you are riding confidently and no longer having to think about how to operate the bike, it has to become such that the mechanical side of your riding is instinctive.
Once you have achieved this then it's time to think of further training and going for an "Advanced" certificate.
The "Durham Advanced Motorcyclists" exist for this very purpose, they have a website at
Attached are scans taken from their advertising flyer and they have a social meeting on the last Tuesday of the month at the Bowburn Hall Hotel near Durham where you will be welcome to attend.