How I feel

Remember the episode of Futurama where Bender goes to the island of
obsolete robots. One of those robots was powered by a water wheel that
she had to keep dunking in water to power. Periodically she would
realize she is running low on water and would panic running to the
water saying, "I'm not going to make it this time!"
I feel that way before each exam. But really, this time I'm not going
to make it!