My best advice to students during finals?
Get your sleep!!
Many studies compare driving under the influence and sleep deprivation. Exams are the same! Your brain will function better if you are well rested.
Superposition: taking one part at a time then summing the results together for final product.
Take a bite of bread, then a spoon of peanut butter, then a spoon of jelly. Three bites to superposition a PB & J sammich.