“I have not failed. I’ve just found 10,000 ways that won’t work.” -Thomas Edison, speaking about mistakes.
If you study for the GMAT for any appreciable amount of time (and you should) you’ll make mistakes. And that’s a good thing. People love to track their study progress with all kinds of metrics: percent correct, time per question, hours spent, problems completed – but in the end the only numbers that matter are the numbers on your official score report. So whether you were 10 for 10 on your homework or 0 for 20, whether you took less than 2 minutes per problem or spent almost an hour trying to figure it out, the key “metric” to your study sessions should be “what did I learn from this?”. And you can learn a lot from the mistakes you made, whether they’re silly (“I forgot to convert hours to minutes”) or confusing (“why does it matter that health care quality improved in the last three decades?”). You just need to know which questions to ask about the questions you missed. And there are four questions you should ask yourself any time you miss a problem: