I am so sick of this exam, this is my third time taking it, because my teacher thinks i can do better, I already have an A in it!
From my experience the long answer questions are always on conservation, food and health and stuff like that.
In the first exam there was hardly any biological molecules and loads of food and health, the second there was a 50/50 split, but it may change again.
There will always be a Q on immunity!