Dear Randip Ji,
Here are my two cents on the purpose of human life as per Sabd Guru/AGGS;
PURPOSE OF HUMAN LIFE
ABSTRACT
According to Sabd Guru the purpose of human life is to earn profitable merchandise (ਖੇਪ) of Naam in this world through an ethically lived life by subjugating the five lower instincts and development of virtues. Such profits can indeed help in emancipation or union of individual conciousness with Universal Consciouness. Guru Arjan in Sri Raag ponders on the subject:
ਚਿਤ੍ਰ ਗੁਪਤ ਕਾ ਕਾਗਦੁ ਫਾਰਿਆ ਜਮਦੂਤਾ ਕਛੂ ਨ ਚਲੀ ॥ ਨਾਨਕੁ ਸਿਖ ਦੇਇ ਮਨ ਪ੍ਰੀਤਮ ਹਰਿ ਲਦੇ ਖੇਪ ਸਵਲੀ ॥
Cẖiṯar gupaṯ kā kāgaḏ fāri*ā jamḏūṯā kacẖẖū na cẖalī.Nānak sikẖ ḏė¬ė man parīṯam har laḏė kẖėp savlī.
The accounts of the individual kept by mythological Chitr and Gupt, or the recording scribes of the conscious and the subconscious are torn up, and the Messenger of Death cannot do anything. Nanak gives this advice: O beloved mind, load the profitable cargo of the Akal Purkh's Name.-----Guru Arjan, Siri Raag, AGGS, Page, 79-18
The full article can be found at this link: http://www.sikhphilosophy.net/spiritual-articles/26784-philosophy-of-guru-granth-sahib.html