Let me tell you what happens when students don't sleep well before examination.
They make SILLY and COSTLY mistakes.
Besides the sinhalese and tamils in the Northern Ireland conflict example,
there's also the wrong citation of sources. The source is supposed to be A, but you wrote B instead. Everything else is correct except the most critical "A". Therefore, no marks!
See lar! Silly mistakes that take away your A1. Sigh...
These come from my best class some more. *shakes head*