From Quora: My Answer to "Where can I find more writing and language questions to prepare for the SAT if I've done all the Khan Academy questions?"
You can buy (bookstore or online) or borrow (from a library, I suppose) any SAT practice exam book - e.g., Barron’s SAT, tons of books by Kaplan, Princeton Review, or Gruber. You can also just Google “free SAT practice exam” to find other test prep or tutoring companies’ sample tests or problems.
Author: John Linneball Who did you think? ;-)
I'm the proprietor and only tutor for this business; that's why I named it after me.