Studying is hard...

When practising to a physics test... Well, he does not need to calculate anything yet, just remember renewable and non-renewable energy sources, parts of solar power plant etc... I'm just waiting what kind of answers he will come up with in a test (in case he forgets some facts).. In a Finnish test he needed to continue the sentence starting with "I don't know,... And he continued it as ... if the cows can fly and if the green piggies are aliens".