How can a young Algerian man who has memorized the Qur'an according to the recitation of Warsh from Nafi', and who does not want to lose it due to frequent forgetfulness, preserve it? And are there schools in the Arab Gulf for teaching the recitation of Warsh from Nafi' and memorizing the noble Prophetic hadiths?

The best ways to firmly memorize and review the Holy Quran are by establishing a daily program for reviewing specific parts. It is preferable that this be during the night vigil (Qiyam al-Layl) and with a friend, while benefiting from recitation tapes and refraining from sins and preoccupation with what does not concern one. There are universities, institutes, and institutions that teach Quranic recitations and Prophetic Hadith. You can check their websites to learn how to enroll in them.