From Twitter:
Dialog
Boy: Did you ace* your test?
Girl: No. I didn't; I blew it.
Boy: Why?
Girl: I couldn't study; my sister and brother were acting up!

Question:
A. To "blow it" means
① to make it bigger
② to do badly　
③ to cause it to explode

B. ”Act up" means
① to be active
② to be up-beat
③ to be bad
________

The answer to Question A is ② 'to do badly.'
The answer to Question B is ③ 'to be bad'

*To ace something is to do it perfectly. Basically it is the opposite of "blow it."