Key stage 3 and gcse?

Whats the diff between key stage 3 and gcse? what is diff between say ocr science for gcse and ocr additional science for gcse? ta!
Answer
Key stage 3 is yr 7- yr 9 the "gcse" years are year 10-11


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Key stage 3 and gcse?
Whats the diff between key stage 3 and gcse? what is diff between say ocr scien...

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