There are lots of books regarding the previous JLPT exams, you can buy one and practice on it just to see how the test is structured
if you want to take the business level japanese, you can take the JETRO exam. But i suggest you pass the JLPT 1 or 2 first before taking JETRO.
The difference between the 2 is that JETRO has an oral exam to test the speaking proficiency.
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JETRO - BJT Business Japanese Proficiency Test - What is the JOCT?