Google allways give credit to Quality links. If you want to add your links from other websites then its good. But follow this things can help you
1) Atleast rank 1 website
3) Not related to Porn sites, Casino sides
4) Not listed in Google Black list
Your site will get display on other website which make increase in traffic from other website. This will makes increase in traffic and your page rank increases. But link exchange is not a good activity as it may leads to consider as violating Google SEO rules.