How long do you spend double checking an answer

From practical standpoint, I doubt whether time permits double checking a question. One has to practice to do problems right on the first pass in my opinion.

For math questions, I think there is a logical sequence of steps: (1) Concentrate and read carefully on the question stem, make sure to understand what the question is asking, and identify any traps; and (2) perform the calculation.

It does not make sense to do step (2) before step (1) is complete.

Through practices, I kind of developed a sense of my set of common/silly mistakes – for example, reading question stem to fast and jump into calculate; pay attention to some tricky keywords (GMAT test writes are good to write tricky questions).

At the moment of clicking the “confirmâ€