50 Active Backlinks from .edu and .gov sites, and from top sites with pr like alexa

i need backlinks from 50 active ,edu and .gov sites with which are very active and will rank me on google and also drive traffic. Not dead links, or spammy links , not links that would reduce my rankings or traffic....if you cannot do it you better leave it,even if you pick up this job and not able to finish up to 50 , just leave it, do not add dead links please..