Hi Debs,
try not to worry too much. I did it in July and got an average of 8.5 so it can't be that bad

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Just get him to practice all the time, even though he wont want to, I know I didn't but it's worth it in the end!!!
Do a few practice listening and reading tests as these parts are relatively easy and as many writing as possible as this is by far and away the hardest - especially if, like me, he hasn't done any exams for years. Time is a big problem, you have 60 mins to write a 150 word letter and 250 word essay which is not so easy when you're under the pressure of an exam so this is why it's soooooooooo important to do lots of practice under exam conditions.
As long as he is fully prepared I'm sure it will be fine.
Mark