It is no surprise that many words in the English vocabulary have roots in other languages. The English language is a very robust collection of vocabulary stemming from Greek and Latin origins.
For the SAT and many other standardized tests, knowing prefixes, roots, and suffixes can help the test taker out of a bind when an unfamiliar word surfaces.
By learning these roots, it becomes easier to learn new vocabulary. This study is called etymologies. Die hard spelling bee contestants use this in their advantage when spelling words based on their root.
In fact, looking up an unfamiliar word in the dictionary will often show you the origin and the language where it came from. Paying attention to these will give an edge to testing.