could i ever revise for this??
Are you talking about the practical? If so then yes, just imagine the flight from hell where your engine starts to misbehave, you see another aircraft or boat or something in distress. You suspect your radio is on the blink. You get lost and need direction finding. All in additon to the standard departure, enroute and arrival protocol and services.
If you are talking about the written, then yes. The trick is that Roger does not mean you understood the message as one answer I came across suggested; in other words the CAP413 related answers have to be verbatim.
After reading the 3 hours comment I expected to see others chime in with how this seemed a long time, so perhaps mine was the unusual one.
The actual practical test was definately in the minutes, maybe 10-20. The whole thing including briefing, getting a cuppa and wot not was probably about an hour. Can't recall the details, it was a totally forgetable experience.