I've been getting 700-760 on 5 practice tests so far...and I'm aiming for an 800 on the real thing. I know that Barron's is much tougher than the real deal, but the problem is not that I can't do the material (i.e. content isn't that hard), but that there simply isn't enough time for me to finish the damn thing, especially because like 2/3 questions require graphing. I always leave like 3-7 questions blank when time's up, so I'm afraid I will run out of time in the real deal as well!
Since I want to gauge my true ability/time management before the real test, what are some more realistic prep books out there? I've got the real collegeboard book (2x past tests) but I'm saving them for the night before the exam. How realistic are Sparknotes and Princeton Review?