I'm about to sit a pilots aptitude test for the second time. The first time I sat the aptitude I scraped through with an "noncompetitive" score so have elected to resit to try and boost my score. The aptitude I'm sitting is an test that runs over 8 hours and covers thing like: Airborne numeracy i.e. quick speed, distance and rate calculations; Bearings and angles i.e. basic navigation; Auditory capacity - this is an interesting test. you fly a dot down a tunnel, you have to listen to commands (fly through the next green circle etc) and remember strings of given code. It's basically a multitasking test with working memory and recall thrown in; Cognitive updating - A complicated multitasking game where you have to juggle different tasks; CLAN (colors, letters and numbers) - a multitasking test where you have to do basic math, cancel out dots (think of guitar hero) and remember strings of code; Digit recall - remember strings of numbers and things like how many time a digit appears; Reading comprehension; and a couple more things. Last time I sat the test I had trouble with mental fatigue, 8 hours in my brain had turned to mush and I was unable to focus. I have been taking oxiracetam for the last few weeks while studying (don't know if it has been working or not) and have got hold of some modafinil (not yet tried it). I'm looking for a stack that will help me be at peak performance on the day.