I'm a driving instructor, so my advice is...
Don't forget blind spots when moving off from the kerb.
Look ahead, plan ahead at all times, and be aware of what could be around the next bend, down the next road etc, and change speed accordingly.
After being asked to pull in, and being careful to check mirrors when pulling in, and signalling left if necessary, only signal right to pull away from the kerb when you have taken your hand brake off. Never sit with a right signal flashing as it can confuse other drivers and could cause another driver to slow down and let you out (big no no)
To follow on from pp advice re speed limits, as well as checking down side roads (great advice), also look out for repeat signs. i.e the smaller speed signs. So if you are on a road that you would deem say a 30, so it is fairly built up, and there are no smaller repeat signs that remind you that speed limit is actually 40/50, then you are safe to assume the road is a 30! The repeat signs will be on roads where the speed limit is not a usual one for the type of road you're on. Also look out for road marking speed limits too.
Definitely do go forward to correct a botched manoeuvre. And don't be afraid to stop and think about which way you need to steer next, or what steering you already have on. Also, really watch speed on manoeuvres and remember cambers that can speed you up on parallel park and turn in the road. Also good observations are key here.
Don't be afraid to ask questions about any directions you are unsure of, even in the independant driving section. You can't fail for going the wrong way/ask about a direction. However you can fail for signalling one way and going another!
There are certain levels of the same fault...for instance, if you stall whilst moving off from the kerb, no one around, you will be absolutely fine as long as you get going safely as quickly as possible. If you stall whilst waiting to turn right in the middle of a busy controlled crossroads, whilst waiting on a yellow box junction, and the lights turn back to red...yes you will fail!! Unless you get going before the lights change to red of course!
If you roll back on a hill start be it at a junction or moving off from the kerb, and there is nothing behind you, depending on how much you roll back of course, you shouldn't fail. If you roll back, especially at a junction, and someone is waiting behind you, then chances are you would get a serious fault i.e fail!
What I am saying is, that as long as you go through your test without doing anything that could be seen as hazardous to others, then you will pass. Drive defensively, be completely aware of everything around you and try to concentrate on driving, not the examiner, you should be fine. You don't have to speak if you don't feel like it. If you like, you can commentary drive i.e talk yourself through everything you are doing e.g a red light, check all mirrors, come off gas, start braking...oh light is changing, change down to 2nd gear, check mirrors, back on gas! I know it seems crazy, but it's amazing how it can make you focus. You can do it in your head if needs be, but the examiner won't be bothered by it!
Anyway, sorry for the essay, and I wish you very good luck