You could use a habit tracking app on your phone, or put a calendar on your wall and tick each day you hit your target.

你可以在手机上使用一个习惯追踪应用，或者贴一个行事历在墙上，每天勾选自己达到的目标。

Every night before he went to sleep, Harry ticked off another day on the piece of paper he had pinned to the wall, counting down to September the first.

哈利把九月一日以前每天的日期一天一天写在一张纸上，钉在墙上，每天临睡前就在第二天的日期上打一个钩。