Ah murphy it is a great course I thoroughly enjoyed it even more so after I saw the result though . There are four course books and in the first the main chapters are nutrition and digestion. Thsi course does not require any outside reading so if you just read the course book thoroughly then you should be fine. The exam is in 3 Parts Part 1 short questions from across the course these. This section is divided so each book is covered in one sub-section. No choice you nedd to attempt everything
Part 2 Data handling question. Information provided in the questions requires interpretation based on what you have learned and also reading graphs etc. No choice
Part 3 Essay question. 4 questions and you must choose 1.
All I will say is that I must have absorbed more informaion than I realized as the books are really well written and as long as you donot fall too far behind you will be fine. This was however the only course I did this year so I could really focus on it. I am couuently doing a short course and next year begin S204.
Good luck and if you want any more info. just ask.