1: Your memorization must be with Quran teacher to help you correct your recitation
2: Memorize everyday two parts, a part after Fajr and a part after `Asr or Maghrib, and with this way, In one year, you will memorize the complete Quraan perfectly, and your memorization will be perfect, unless you increase your memorization, because if you do, what you memorized will weaken.
3: Your memorization should be from Suran an-Naas to Surah Al-Baqarah because it is easier. And after you memorize al-Quraan your review will be from Surah al-Baqarah to Surah an-Naas
4: The memorization should be from a mushaf with the one print to be certain about the strength of the memorization and quicker studying the places of the ayaat and the ends and beginnings of the pages.
5: Everyone who memorizes (the Quraan) in the first two years loses some of what he memorized. This is called the “Marhalatut- Tajmee`”, roughly translated as the “Gathering Stage”. So do not worry about the Quraan leaving you or making many mistakes. This is a difficult stage of affliction which shaytaan has a portion of to make you stop memorizing al-Quraan. So do not pay attention to his whispers and continue memorizing it, for it is a treasure that is not given to just anyone.