Question 5: Is it permissible to recite the Soorahs (Qur’aanic “chapters”) in an order other than that of the Mus-haf (copy of the Qur’aan), for example, Soorah Al-Falaq before Soorah Al-Naas or something like that?
Answer: It is better to recite the Soorahs in the order of the ‘Uthmaanee script of the Mus-haf starting with Al-Faatihah, then Al-Baqarah, then ‘Aal-‘Imraan, and ending with Soorah Al-Naas. Accordingly, reciting Soorah Al-Falaq before Soorah Al-Naas is in agreement with the order of the ‘Uthmaanee script… read more here.