In a few cases it may happen that you speak a language that you wish to choose as you third language, which cannot be proven by an accredited language institution, simply because these institutions or exams are not available. This means that you cannot use this language for your application. For example, if your secondary or university education was completely taught in Hindi, then you can claim Hindi as your third language. But if you did not have secondary or university education in Hindi, you cannot claim this language as your third language, because there are no accepted methods of proving your level. A passport alone is not proof of proficiency of a language.