pick up the knowledge

[Maybo]

Am I using "pick up the knowledge" correctly?

John: Why did you resign?
Bob: I want to go back to school and then apply for university.
John: That's great!
Bob: Before the school starts, I need to pick up the knowledge I've already forgotten.

 

[jutfrank]

Where did you get the idea that "pick up the knowledge" is an expression? It isn't.

 

[Tarheel]

Bob's confused. First, you decide you want to go back to school, and then you apply for university. Second, you don't pick up knowledge. You learn things.

 

[Maybo]

How about "relearn the knowledge"?

 

[Tarheel]

Not exactly. However, If you have forgotten something you can relearn it. (I have never seen or used that phrase.)

 

[jutfrank]

How about "relearn the knowledge"?

I say no. That's no good at all. You can't learn or relearn knowledge. If you must use the word knowledge, the best collocating verb I can think of right now is reacquire.