Prepare for the OCR Gateway Science A GCSE Chemistry (J248) exams: understand the structure of the papers and the Foundation and Higher tiers, the assessment objectives, command words, and the required practicals (PAGs); master 6-mark extended-response technique, the maths and graph skills chemistry demands, and the most common mistakes; and walk through a full paper. Worked examples, exam tips and graded model answers to turn knowledge into marks.
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