There's no other reason to self learn, you need to know every single dot point, and as stated above, most teachers don't do this well enough and don't tell you which dot point they are teaching.
Dont use it, it's crap, possibly the worst textbook ever written, just do stuff out of fitzy and follow it up with Cambridge, that's all you need to do, tell your school to take a hike (up Everest).
Also with your example, the person coming first, will keep their external mark, in this case 99, and his external and internal mark will both be 99, being 99 overall
for you, if you're second, and you externally get 95, and that is the second highest external mark, you keep that mark, as both...