Question

You won’t pass the test _________ you study.

Answer 1

You won't p.a.s.s the test unless you study.

Detailed answer

The most appropriate word to be used here is unless. This denotes that the person won't clear the exam till he studies.

• This is the most grammatically appropriate word to be used here and makes the sentence a proper sentence.
• The word "unless" is used to show that "(used to find  the case in which a statement being created is not true or valid")
• Any other word may not be proper at this moment.
• Another word we can use here is "Until"