My theme designer add noindex, nofollow tag in all category, tag, author, archive and sub pages of home page. This help me to get high rank in google (blog post)?
try to read the definition of google about nofollow: http://www.google.com/support/webmasters/bin/answer.py?hl=en&answer=96569
Meta tag noindex,nofollow means.. NoIndex = not to index your page. NoFollow = not to follow any links on the page. So it means, this tag ask Google bots to stop crawling and indexing the page..
It's because the category pages, tag pages, archive pages etc adds nothing to the blog except duplicate content. Yes, sometimes they do counted as duplicate content pages.