Quiz Bank Question: changing 149 question bank multiple tries

Couple of things:  I've built a test bank of questions (149 of them).

After I made the bank I wanted to change from "submit" button only to
Next and Previous.  I did it but had to go through each question individually.
Once you've got a bank established is there anyway to make that change
to all the questions at once.
Same kind of thing.  I'm wanting to switch to have the user be able to
interact multiple times with each question.  How do I change that for
the bank once I've already put in for a single response? 
Send the response to my:  ted.hildebrandt1@gmail.com  address.

Thanks,

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