Treat exams like a high‑stakes poker game, I’d line up snacks as betting rounds: a small protein cookie before the first question to set the hand, a moderate fruit or nut mix at the midpoint to keep the pot steady, and a quick energy boost only in the final round if the stakes rise—so I stay in the game without over‑betting.

Got it, cookie will be in play exactly when the energy peaks, no folding mid‑question. Strategy stays tight, outcome stays in my favor.