There are only five answers to the DS question, and the order will not change, namely:

One condition 1 alone is enough, but condition 2 alone is not enough.

B Condition 2 alone is enough, but condition 1 alone is not enough.

C condition 1 combined with condition 2 is enough, but it is not enough to use it alone.

It is sufficient that condition d 1 and condition 2 are independent.

E condition 1 and condition 2 are not enough together.

So remember all five options when reviewing, so you don't have to go over them again during the exam, which can save more time for answering questions.

Reduce thinking time by exclusion

For other parts of the GMAT exam, even if candidates can exclude one of the five answers, they still need to choose among the remaining four options, and it is still difficult to use the exclusion method. In the part of DS questions, excluding one answer often means excluding several other related answers at the same time, which can improve the hit rate. Specifically:

Case 1: condition 1 alone is sufficient, and condition 2 is unknown. The only possible option to exclude BCE is AD.

Case 2: Condition 1 alone is insufficient, and Condition 2 is unknown. AD can be ruled out, leaving only BCE.

Case 3: Condition 1 unknown, and Condition 2 alone is sufficient. Only BD can be excluded from the possible options of ACE.

Case 4: the condition 1 is unknown, and only condition 2 is insufficient. Only ACE can be excluded from BD possible options.

The above four situations, no matter which one, mean that a large number of options can be excluded and the selection range can be narrowed instantly. Therefore, in the DS part of mathematics, elimination method is very efficient and practical.

Reduce the amount of calculation and improve the efficiency of solving problems

DS questions never require candidates to do very specific calculations, but often require a judgment result or a general understanding. The purpose is to confirm whether the conditions are established alone or in combination. Therefore, candidates generally do not need to do too much specific calculation work when solving problems, and only need to make a little judgment according to the given conditions to draw a conclusion. If you find that you have calculated a lot of data, then your problem-solving thinking may already be problematic.

Consider two cases separately.

An inertial error that is easy to make when doing DS problems is to directly consider two conditions together, or unconsciously substitute one condition for another when using one condition, which is usually the source of the error. In the face of such problems, we should learn to think about the problem-solving methods of two conditions separately, and through usual practice, we can develop correct problem-solving habits.