My IT teacher created a resource booklet with all information about the topic from the inset by WJEC. I then focuses my revision around that and hoped to god I'd remember it. The three new developments were; prosetetic limbs, blood barcoding, PET scans and the like. The control of the hospital came from common sense so for example a doctor checking a patients health status from his office. The sensors were; intercranial pressure, oxygen saturation sensor and other I have now forgotten. A question similar about scans and blood barcoding came up a few years back so I memorised that answer for the rest.
I did my revision through past papers and I seem to have lost a total of 7 marks going through the paper with my teacher.
At this very moment I'm just going through all of the IT3 past papers memorising all of the mark schemes. The 15 year old is still going, although very exhausted!
Good luck to you tomorrow, I'm sure you won't need it.
James