CIE May/June 2015 resources updated.

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I desperately need help as to what O Level subjects to choose. We only have three options in our school. Biology or Economics, Chemistry or Accounts, and Physics or Environmental Management. I need to know which is the easier of all these subjects. I am good af rote learning and get good marks. I just want to know the subjects that will not cause me too much difficulty in O Levels and will also not be too "useless" for colleges or universities. Thank you. Also, keep in mind the new O Level syllabus.
 
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The acid V contains two carboxylic acid groups and has the molecular formula HO2CCxHyCO2H, where x and y are whole numbers. Deduce the values of x and y in the molecular formula? I urgently need the method or formula to solve this question. Kindly help me.
 
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