The University of Düsseldorf is researching whether or not it is possible to diagnose our level of English proficiency online. Take the test and you will know whether you are A1, A2, B1, B2, C1, or C3. Beware, for A you need to know your tenses, for B you need to know your if-clauses (yikes) and for C you have to have an extensive vocabulary. So what’s your score?