My mother was suppose to be German as her family immigrated about the turn of the last century. I have a complete history going back several generations, all in Germany. The DNA test said differently, apparently the Goths that invaded Germany in the 4th century were a major part of my families DNA make-up, hence the Scandinavian component.
I had my DNA test through Ancestry.com, about a 100 bucks. You can spend a lot more at other places and get a more accurate complete breakdown.
I wanted to prove my NA heritage even though no tribes accept DNA as proof of ones NA percentage. Turned out I didn't have any percentage.