roughly, what should i aim for if i'm hoping to pass the test, out of 24?

Hi,

You have to get 18 out of 24 questions right(75%) hope this helps.

You should  read study guide or material once or twice.  Test is very easy. There is no mark system. You should aim to pass the test that's all.  You won't be able to know your score after the exam. If you work very hard and get full marks, or if you don't  and get passing marks, both are same.