For Pacts and other important upkeep triggers I've found it handy (and legal) to place a die on the top of the deck so I don't derp out.
Totally legal (and recommended) to write down revealed cards from their hand. Don't have to be tryhard anal about it but having quick notes of important cards is very handy because even the best can't keep track of all the cards and permutations at all times. Another useful toolbox item is a notebook that shows what to sideboard to what deck/card and to note where you made fumbles and mistakes (as well as ingenious blowout plays you did).
Building play consistency, lowering variance, and tracking your metagame are the three things that pushes a player from average to competitive FNM and FNM kingpin to respectable PTQ/Open Series finishers.
XI Wiki



