Sorry to be the bearer of bad news, but actually gets worse on the actual exam. i.e. The Data Sufficiency gets worse on the actual GMAT. I just followed teh princeton review tips. Answer goes in format.
Can either be A,C or BDE. So that narrows your chances of getting it right. try A. Id A fixes the question, then the only other alternative will be D. If first clue doesn’t solve,then the optiosn are B,C or E. The Data Sufficiency takes up a lot of time in the actual exam.