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How to study for a science exam
Know the test format and subject material.
This is the best place to start, as you don't want to study things that won't be covered on the exam.
This will help you frame your studying so you can gather all relevant readings, notes, handouts, and labs.
This will also help you decide how much time you need to allot to studying for the exam. Knowing the format of the exam will help you know what techniques would be best to study for the exam.