First rate course, great instructors BUT you have to keep up with the programme prior to the revision courses. You are using up 4 sittings so it important to achieve a high percentage of 1st time passes. I completed the course 18 months ago also with first time passes and an average 89% mark. Proof that hard work plus excellent instruction does pay dividends.
The 4 week long revision periods were invaluable. To me it was quite amazing how they managed to get us up to the required level in such a short timescale. Also doing a maximum of 4 exams at a time is quite manageable doing 6 or 7 would have been much harder.