Correct phrasal verbs

Correct the five errors in the phrasal verbs in the following tips.

How to perform well on an exam

* Don’t put up (put off) studying until the last minute. Set aside an hour each night to study for a few weeks before the exam. Brush up on any materials that you don’t understand well.

* Show off (show up) at the examination room a few minutes early.

* Wait on the teacher to give you directions before you begin.

* Think up (think for) each question before you answer it. If you can’t ?gure up (figure out) the answer to a question, don't spend too much time on it. Otherwise you might run out of time.


My corrections are written in bold.

Are they correct?
I couldn't find the fifth error.

Thank you.