Durga saptashati .....read the post below it's not about astrology.

Someone after reading my chart said to me that my ishta devta is Bhagwati Durga ........so I want to know that can I only read 13 adhyay of Durga saptashati...... without reading kavacham,argla,keelam,siddh kunjika stotram.....I am not initiated to any guru.....i am pure vegetarian.....I am 18 year old male....so please tell me can I only read 13 adhyay of Durga saptashati..... please do not provide me with any alternative... please answer my question.