I have found myself in several spots within attraction phase where I start being asked torrent of personal questions llke "what do you study", "where are you from?", "how many brothers do you have?", and more, al of these in a row.
So, two things:

1- since being asked a personal question is usually an IOI, is it that multiple personal questions in a row mean multiple IOIs?

2- I am having issues calibrating my attitude and responses toward these questions.... for instance, I know I have to remain a challenge and the such, but sometimes avoiding a straightforward answer comes off as weird.... And it gets more difficult when there are multiple questions being asked. How to proceed?

some could be ioi's some could be shit tests.
I would recommend, to keep her guessing and using funny answers such as,
her:What do you do for a living?
You: im a profesional troube maker

just funny little come backs.

If shes askin them constantly just neg her with something like "jeese i just met you, are you a cop or something"

Hi profilactic,

It does sound as if this girl is interested. All those questions and how do you handle them? Well it depends. Some say you should be confident and proud of yourself and answer them directly and others say to make up a funny answer or just ignore the questions.

I have literally just finished watching a Lance Mason clip where this situation is answered well. It depends on what other interaction has taken place and how you have conveyed yourself in that. If for example you have been talking a while and in general have come across as funny it's probably wise not to answer her questions jokingly. She may think you can take nothing seriously and you're typecast as a joker. The opposite may also apply. Girls don't want one dimensional men.

Try this link. About half way down the page there are 2 long video clips and Lance gives suggestions on how to answer these sort of questions, plus a lot more besides
http://www.pickup101.com/birthday/

http://www.pickup101.com/birthday/