i'm very sorry, but your comment is not on par with reality.
Did you actually read the OP post (the book adresses FC4)?
Do you know how these type of courses work (theory/practise aligned etc)?
Do you know the danger of stepping outside of the provided/required materials?
And it's not about how a kernel works, it's how the complete system functions (in this case FC4), and there is a reason for it: examination/certification
kernel development (where you truly get to know the kernel functions
) is a complete different area.