Hi there I'm new to this board and I'm having some major issues with my driving test. I'm on my 4th attempt and my tests have come in yearly cycles. I take lessons and book a test, normally before I'm ready because I run out of money, fail, then have to wait another year to get the money for another test, so I've been stuck in the vicious cycle for about 5 or 6 years now. I have a test coming up next week and I just need some help with some general driving issues.
1)What is the deal with box junctions?? When should I go in and when should I stay out? I've waited before and people have come from the left and piled up in the box and I've been left not being able to move for ages, or I'll go into to the junction because my exit looks clear but its not and I've been stuck there too.
2)How can I guess what people are going to do on roundabouts when they don't indicate? I'm not a mind reader, and I've been failed for undue hesitation before because of this. I've tried to judge by position but I failed my second test when I pulled out to take the first exit when this guy was on the inside indicating right, he then cut across three lanes of traffic and cut across me to the left (while still indicating right!) causing me to brake harshly, resulting in a fail.
3)I also don't really understand where to position on roundabouts very well

4)I have real issues with confidence and nerves, I MUST pass this test because I will run out of money again if I fail and end up spending £100's more all over again. Does anyone have any advice on controlling nerves? I can't control the clutch on tests because my legs twitch so much.
I know there was much more i wanted to ask but I've forgotten

I'm just stressing out so much, if anyone could give any advice, i'd appreciate it soooooo much.
Laura