There is also quite a bit in the Study Pack including worked examples for several Past Papers; you ought to get it issued to you when you apply to sit the exam.
I posted a draft version of the headway / braking portion on this Forum much earlier in the year: http://www.irseexam.co.uk/attachment.php?aid=1
Also a word of caution that "Sighting Disance" does actually mean something quite a bit different for Metros using 2-aspect Red/Green signalling (rather than multiple aspect signalling in which there is aspect sequence giving the driver prior notice of the need to stop). Since this means that the driver must be able (from whatever is the approach speed) to stop the train within the distance for which it is visible, there are fomulae to determine what this should be in various circumstances.
I posted a draft version of the headway / braking portion on this Forum much earlier in the year: http://www.irseexam.co.uk/attachment.php?aid=1
Also a word of caution that "Sighting Disance" does actually mean something quite a bit different for Metros using 2-aspect Red/Green signalling (rather than multiple aspect signalling in which there is aspect sequence giving the driver prior notice of the need to stop). Since this means that the driver must be able (from whatever is the approach speed) to stop the train within the distance for which it is visible, there are fomulae to determine what this should be in various circumstances.
PJW