As above, I have the exam tomorrow and I have a very good memory for figures etc, but the water regs looks as though it's going to be a challenge even for my retentive head !
Open book ! So it will have the question and say "module 14 page 6" sp u know your answer is on there ! Key is to read slow and use all you time ! Good luck mate
The exam is designed to make you get used to finding the info from the regs. It's more about proving that you know how to look things up than knowing everything by heart.