Obsession with twngan

I talked to my boss about C-exam again today. He said repeatedly that it is not such big a deal. Well, according to the 2 passes out of 6 takes history last year in our group, I am not exactly that optimistic. Maybe I'll not be so crazy like others to study the implementation of something like mbuf, but I did spend some time reading some more important data structures like pcb and vm.