In our Tamil Nadu state board, writing the formula first is a must—they call it the 'step-marking' system, and skipping it will cost you marks. Units and significant figures are also checked strictly, especially in practical exams. I remember my chemistry teacher, Mr. Subramanian, would take a full mark off just for a missing unit, saying "precision is the first sign of a disciplined mind." So, for us, these small things protect marks; they are never overlooked.
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