Significance of Order of Surah in Quran

The question of why a surah like Surat Al-`Alaq, which was revealed first not put first in the mushaf
(a physical copy of the Qur'an), this will require us to search more in
the Qur'an and explore some of its secrets. A deeper look into the
whole matter will show us that the order of the Qur'an has a purpose
and the revelation of the Qur'an also has a purpose.

For
instance, the revelation of the Qur'an responding to specific problems
or incidents carries the purpose of solving these problems or providing
guidance in these incidents.

During
the first 13 years of Islam, the main task of the Prophet (saws) was to
call people to Islam based on the Qur'anic revelations that focused on
the Oneness of Allah and righteous conduct.

When
Muslims migrated to Madinah and an Islamic community started to be
well-established and new challenges emerged, the main focus of the
revelation was to regulate the life of Muslims through detailing the
rulings pertaining to different acts of worship and setting punishments
for crimes and so on.  

This
shows us that the revelation in each of the two stages has a purpose.
When the revelation stage was completed, the whole Qur'an was there and
the whole message was put in the order that was intended for it to stay
till the Day of Judgment.

jazakallah khayran..

May Allah (SWT) bless u all......

ammeen