According to hadith, the Qur’an is revealed in seven ahruf.
Malik Ibn Anas has reported: Abd Al-Rahman Ibn Abd al-Qari narrated: “ Umar Ibn al-Khattab said before me: I heard Hisham Ibn Hakim Ibn Hizam reading Surat Al-Furqan in a different way from the one I used to read it, and the Prophet himself had read out this surah to me.
Consequently, as soon as I heard him, I wanted to get hold of him. However, I gave him respite until he had finished the prayer. Then I
got hold of his cloak and dragged him to the Prophet. I said to him: “I have heard this person [Hisham Ibn Hakim Ibn Hizam] reading Surah
Al Furqan in a different way from the one you had read it out to me.” The Prophet said: “Leave him alone [O ‘Umar].” Then he said to Hisham: “Read [it].” [Umar said:] “He read it out in the same way as he had done before me.” [At this,] the Prophet said: “It was revealed thus.” Then the Prophet asked me to read it out. So I read it out. [At this], he said: “It was revealed thus; this Qur’an has been revealed in Seven Ahruf. You can read it in any of them you find easy from among them.
From the above hadith, we can understand that Quran can be recited by following any of this seven ahruf. Also we can see how the companions considered the recitation of Quran. Bearing this in mind, we provide Qira’ath training for our students to mold them into perferct Hafiz.