Direct and indirect speech - a particular instance

We were supposed to put the reported conversation into direct speech. (everything taken from the workbook New Matrix)

"She asked me (1) if I had earned a lot of money. I told her that (2) I hadn't, but added that (3) I got free meals."

The conversion of this reported conversation into direct speech would be then:
(1) Did you earn a lot of money?
(2) (No,) I didn't.
(3) I get free meals. => The problem arises here. I think the workbook made a mistake. The book is rather, in my opinion, strict and old-fashioned in grammar and holds the view that in reported speech should be backshift or whathever it is called.

Therefore, I wonder if the (3) is a typing-error, grammatically correct or just a mistake (if we don't apply this to modern textbooks. And so, shouldn't it be rather:....but added that I had got/gotten free meals to make the proper sense of sentence when talking about the past?

Then, what seems to me as a nonsense is this sentence.
(4) She wanted to know what I had done before I started the job.

What have you done before you start the job? - Grammatically unacceptable to use.
What had you done before you start the job? - Grammatically wrong.
What did you do before you start the job?

I really don't know how I could put this into direct speech and I also figured that all the possibilities are impossible. Therefore, in my view, it is a nonsense which is written in the workbook.

Thank you so much. I know this is rather long though I am refering to some basic stuff. I'd like to know this well as I could possibly arque with my teacher about this.