sponge (bob) brain

i have an exam on saturday, my last paper for the entire programme which i started in 2009/10. i dont have a clue what to write come saturday. in the past, i somehow knew what i was going to scribble but this time its just ridiculously impossible. its a seen paper, we got the questions last friday but i never got round to start any revision - what with preparing for induction and the new term. i escaped from work place to stay at home on thursday & friday, trying to absorb whatever i can. 

they say "child's brain is like a sponge, capable to absorb enormous amount of information and as we grow older, brain power tends to decrease" and in my case, becomes like Sponge Bob!

at times like this,  the burning question is - what the heck am i doing? at this age? what am i trying to prove?

if its not for this one last paper, i would have given up..honestly!!