Error carried forward is when examiners give you marks for using your wrong answer in the next step—they know the pressure. This 3 significant figure rule? Ah, sometimes they are strict, and marking says "round to 3 s.f." and if you write 21.6 instead of 21.58, you might lose a mark. Back in my school, we didn't have fancy coaching to learn these tricks—we learned from our own mistakes in practice, like practicing a raga until your fingers remember.
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