Duplicate content will always be problematic. With robots.txt file you can block the path which is duplicated.
If you provide the content in user language, then it will be easy for him to understand & spend some time on the website, which will ultimately...
Increasing page rank is a very slow activity & takes long time to improve. It depends on your efforts in improving online presence for your website.
Check DA & PA for the respective website where the back-link is coming. If they found low in both the aspect, then remove your link from such sites.
Check your website from various on-site optimizer tools. Check for the errors & correct them. Check webmaster account & see if there is any...
Separate names with a comma.
