Once upon a time CPA Candidates had to sit for all 4 sections of the CPA Exam on the same day. Luckily for you and I, that's no longer the case.   Today the exam is structured so that candidates can decide how many sections they want to sit for in each quarterly 2-month testing window.  One major caveat to this however is that Candidates must pass all 4 sections within a rolling 18-month period.…