There is no credit requirement, as long as you don't fail any subjects when you graduate (make-up exams that failed before). If you fail in any subject when you graduate, you will have to take the make-up exam in June. If you pass the exam, you will be awarded a certificate. If you don't pass the exam, you will be given a certificate of completion and will take the exam again in September. If you pass the certification, you will be awarded a certificate.