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I have written a hub on this subject called smart drugs, I don't think I would take them because we do not know the long term effects.
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No, you don't need any stimulant to pass your exams. Just be prepared with the right kind of materials and you are good to go.
No - I would work on improving my learning abilities in a more sustainable way by practice rather than by using drugs.
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Copyright © 2017 HubPages Inc. and respective owners.