Is it helpful to retake practice tests?

<p>I had retaken the problems that I got wrong. Is it beneficial to take the entire practice test again? Or should I just buy new prep books?</p>

<p>Sometimes its good to look back at old tests and just go over them from memory. Just to make sure you remember all the mistakes that you tripped up on the first time so you won't make them again. And other times you learn something from a test you took after that one and you can go back and find out why you got a problem wrong if you couldn't figure out the first time around.</p>