Do edu blog has advantage over blogspot or wordpress ?
 

I observed that getting a edu blog is not an easy task.
So, what is the possible reason for that ?
Is it that google give more importance to edu blog when compared to blogspot or wordpress ?

Lets just keep a blog a blog. It is a presumed rationale among webmasters that edu blogs (and links) speak relatively high quality than a wordpress/ blogspot blog.

The fact is that any blog (whether edu/ wordpress/ blogspot) cannot rank higher unless it delivers quality and is relevant to the end-user.

I have personally seen many non edu blogs doing quite well in terms of SERPs and traffic.