Put yourself in Phelps Face mode and just staying in the zone while eating, drinking, and moving around to get the blood flowing. Test taking is such an individual thing. Stay in that zone if it works best for you.
Half Blood Prince down. Goddamn, I forgot how dark these books get. Ugh. Starting Deathly Hallows now. At this rate I'll finish Cursed Child by gray day, which was not the plan, lol.