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mimishyu
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The official diagnostic test is of high quality. You are correct in your observation that its questions are harder than many of the ones in the sections.

Note that the diagnostic test is untimed. It is not meant to be taken in a timed setting. Instead, it should be used to work through the concepts in as much amount of time as is needed. Doing the problems in this manner will reveal weak spots.

There would be little point in doing an easy diagnostic. Easy questions will provide false diagnosis.

Both sections consist of hard questions. So, you should not be too concerned if you cannot solve many of the questions. Use the insights you gain to draw up a proper study plan. Since your education was mostly in Mandarin, you may need more time for study. The good news is that with practice, you can get much better.

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Hi mimishyu,

For now, I would not really worry about the diagnostic from the OG. The best thing you can do is take a full-length official practice exam, so you can get a baseline score. Once you do, feel free to report back here, and I can provide some further advice.
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