The Five Forts is one of the best strategies of memorizing the Quran. Think of memorizing the Quran like building a fort. To construct it and maintain it you need five things:
1- Constant continuous reading of the Quran.
2- Preparing the recitation before class.
3- Old revision.
4- Recent revision.
5- Memorizing new portions of the Quran.
All the above 5 tactics work together in guaranteeing a strong memorization.
To memorize the Quran is not a matter of committing to memory new portions of the Quran and that’s it. It is necessary to revise the old Surahs as well as the recent ones. This strengthens the memorization and maintain it.