I am applying for a PhD in accounting. For my GMAT prep I focused on one area at a time (of the 5 or 6 on the GMAT) - for me this was 4-5 days per area and doing an hour a day (if you have more time great, I didn't and got up early to fit it in). I just did question after question from the official guide on the specific area for 5 days. With your background you would have the basics under control, you should simply focus on the questions.
Hope this helps,
hi, i am applying to MS Accounting programs and possible 1-2 PhD in accounting, to which schools r u applying for your phd in acc?? thanks