exam -just a game of concentration

Exam dates are nearing, but my knowledge for the modules are still getting nowhere.
The words in the lecture notes seem friendly to me, but then joining them up to form a sentence is very confusing for me.
Why is it so hard to study for exam?

Many questions came to my mind, leaving me worry for my future.

Concentration!!!!
I need that!

concentration concentration, this is a game of concentration.....
basically i am suck with this, whenever i played these games (7-up, fruity game, big small fish,...etc)