Once you secure a legitimate N4 PDF (or workbook), do not just read through it.
The NAT-TEST is a Japanese language proficiency exam designed to be structurally similar to the JLPT (Japanese Language Proficiency Test). It has five levels: N1 (most advanced) to N5 (beginner). The tests basic Japanese comprehension – around 150–200 hours of study, covering about 300 kanji and 1,500 vocabulary words. nat test n4 old question pdf new