Time is likely to be short. First, answer the questions you know without extensive recourse to the materials. Know the basic answers and, if necessary, find the exact formula, numerical value, or supporting evidence for your answers.
There may be enough time to quickly refer to the materials, but not to learn something new. Copying long passages or quotes is a waste of time; instead, paraphrase and focus on any information you find in your submissions.
Strive for concise, well-reasoned answers. If you have time to review at the end, you can check your submissions more carefully to ensure the accuracy or find additional points.
