Relax with a virtual journey
I know that you are stressed with so many examinations, let the books aside for a while, take a break and relax a little bit.
Here you have some ideas:
Explore this website and travel in the Beagle with Charles Darwin around the world (and switch the sound on).
If you prefer, visit the Sistine Chapel in the Vatican or explore a european virtual museum (you can choose which one).
A brain game from the National geographic society.