According to Ebbinghouse's forgetting curve, 58% of the learning content remains in your head 20 minutes after memorizing and only 33% after a day. Only 21% of the learning content remained for more than a month. The way to overcome the speed of oblivion is that the more you learn, the slower the speed of oblivion becomes and remains in your memory for a long time. As the number of repetitions increases, it goes to long-term memory. Study efficiently through the periodic review method of the review planner.

· All data is automatically backed up to the server and linked in real time for several devices.

· We inform you of the periodic review schedule by date through the calendar.

· We will make a review schedule excluding holidays through the holiday setting function.

· You can push or pull back schedules that you haven't achieved.

· You can set a schedule confirmation message notification at a specified time.

· You can create subject categories for each user.

· You can create a review cycle for each user.

· When the newly added schedule is completed today, the schedule before bed will be automatically added.