Slots to take the Japanese-Language Proficiency Test (JLPT) in December filled up within days after applications opened in late August — leaving would-be test takers high and dry.

The stakes of failing to secure a spot for the biannual test have become much higher as Japan tightens rules for visa applications and renewals to require proficiency in the Japanese language or passing a certain level of the JLPT.

Japan Educational Exchanges and Services (JEES), the organizer of the JLPT, opened applications on Aug. 24. It originally planned to accept applications until Sept. 7.