J-CAT examination single try?

Hello, I won a scholarship and got into a university in Japan, unfortunately they don't accept JLPT certificates older than 2 years, so I need to sustain the J-CAT to prove my proficiency. The test should be done through a proper association and not privately, though is there a way to do it beforehand through a different university/association having at least the chance to get a scoring?

by Incha8