This is the 158th most frequent Dutch word.
juist
Correct; right; exact.
Here, 'juist' is used as an adjective meaning 'correct' or 'accurate'.
De informatie in het boek is juist.
The information in the book is correct.
In this sentence, 'juist' is an adverb meaning 'just' or 'exactly' and describes the timeliness of arrival.
Ik kwam juist op tijd aan voor de trein.
I arrived just in time for the train.
Here, 'juist' again functions as an adjective, meaning 'correct'. It specifies that the answer is the one that fits rightly to the question.