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in 2011 51 aligned to 79 for chemistryBiology probably low 60's and chemistry mid to high 50's.
Remember, this is purely speculative and based on previous information and trends. This is not conclusive, as the exam could be comparitively easy to previous years, and therefore the aligning would lessen to accommodate for the difficulty of the exam.
I was leaning towards an average and possible guesstimate looking at trends all over years, but I was relying on my memory when I saw that database a bit ago.in 2011 51 aligned to 79 for chemistry
OP, just download the raw mark database