help with ocr biology 7 course work marking ?

i don't know what like Ib4, and Ib6 Ea4 etc mean

Can you explain a bit more - in what context are these abbreviations used?
10 March 2011
like my teacher put marks next to some paragraphing i wrote for my biology osmosis coursework.. my scores were like Ia8, Ib6, Ic2, and Ea2 Eb0 ?? and they were averaged ? i don't understand them
10 March 2011
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