Palm sweating, Yang Ge kept scribbling on the paper as he fought to arrive at the end products of one of the chemical reaction questions. 

"Amine group is on this side there is a double bond in what? Is that a nitrate group? Oxygenation in step 4 but with a triple bond above...."

Yang Ge's voice trailed off when he saw the annoyingly long chemical equation that was labelled with roman numerals. It was complex molecular chemistry involving hybridization of chemical structures.

Unconsciously Yang Ge started tearing up due to the difficulty of the question, his hand was shaking while battling to solve the equation. Heart pounding and tunnel vision, Yang Ge kept on writing until he heard the examiner's voice.

"Stop writing! Now pass your papers to the front!"

At that point, Yang Ge's heart sank, he didn't get to finish his chemistry exam. 3 questions away from completion, Yang Ge sorrowfully surrendered his exam paper.