My CTR is very very low but Why?

Generally depends on the CTR website or blog content where advertisers are interested to spend a maximum of click.Choosing Stories like Ramayana, Mahabharata, will pay you less than the choice of software, Afiliate programs, Forex, like that. 

For a new publisher, not unhappy, Best PPC ads to start days.Then select depends on the content you decide to put ads on it. 

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Google Keyword – Bangla Ebooks – Blog Story - Free Article – Live TV  - Top Web Portals – Earn Money -   BD Model