Is there significant difference between the two? Please elaborate.

Is it possible to start my own practice after becoming a CPA in USA or do I need to work for a company ?

I am thinking there would be some books or online resources that you may have used for preparations. Could you please share a few pointers which are the best ones that are very helpful?

Are the questions subjective or is it more like a multiple choice question-answer? If it's subjective, were you able to finish your exam on time?