Read the accompanying text information carefully and try to understand the big picture the information is trying to paint
Pay close attention to the units of measurement used in the question and in the statement.
Try to identify possible trends and relationships between the data given in the question, such as spikes, inverse or direct relationships, etc.
Check the required answer choices before proceeding with calculating the answer. The answer choices will give you an idea of what calculation needs to be performed and the accuracy required. For e.g. calculating absolute increase vs. percentage increase etc.
Do not confuse numbers with rates or percentages. [Please visit www.gogogmat.com for more about GMAT course.]
Familiarize yourself with the different ways in which data can be presented graphically such as pie-charts, graphs, etc.
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