Do I have to take CNA class to be eligible to take CNA registry exam?

For the college that I'm looking at, one of the requirements to enter

RN program is to pass CNA registry exam.

(and have active status as Illinois CNA)

However, I'm not sure if the "CNA registry exam" is something that I can

study on my own.

Do I have to take the CNA class to be eligible to take the CNA exam?

I know that the college that I'm looking at is offering a CNA course.

And I think that course includes clinical rotation.

I'm not sure if I have to take this class because since this class is one semester long,

this means that I have to wait one more semester to actually apply for the RN program.

Also, is it hard to get a job as CNA in Chicago & suburbs?

And what is the pay scale like for new CNA in these area?

(I'm thinking about working part time as either CNA or pharmacy technician.

I just can't decide what would be the better choice for me. (in terms of pay))

Thank you for the help!