Questions on an accounting license examination conducted Sunday by the Japan Chamber of Commerce and Industry may have been leaked to students at accounting schools, JCCI officials said Wednesday.

According to the JCCI, the Tokyo Chamber of Commerce and Industry received an accusatory letter, postmarked Saturday, from a student who took the test. In it, the student claims a teacher at a school in the capital had leaked questions on four of the five sections on the second-grade examination to students over the phone.

The questions cited in the letter matched those on Sunday's exam.

The questions are always written by university professors commissioned by the JCCI, while teachers at accounting schools are not involved in the process, the officials said.

The JCCI said it will question the teacher named in the letter, as well as the student who wrote it.

The license examinations are conducted three times a year and have four grades. There are about 500,000 applicants annually, according to the JCCI.