How to explain my lowest grade?

<p>I have 6s and 7s in all my classes (IB) except for spanish in which I have a 4. This is because, according to my teacher, the course is graded throughout by what you are expected to know after two years. Meaning that it is literally impossible to get a grade 7, 6, or even 5 in the first year of spanish. Spanish will bring down my GPA down significantly due to something that is out of my control, how can I account for this when applying for university as the university will probably not understand or care about the way the grades are done in my school?</p>

<p>I envy the person who went their whole High School career without an unfair teacher because life is unfair. However, the idea stated above it not a bad one.</p>