If you take both old and new SATs' in your junior year which do they
record? The best score, the most recent?

"Some colleges, like those in the University of California system, say
they will look only at scores from the new SAT (or the ACT, which also
has a new, optional writing component).

But others are handling the transition year differently. More than 80%
of schools that responded to a recent survey by test-prep company
Kaplan Inc. indicated they would consider, in varying ways, verbal and
math scores from either test.

Duke, for instance, will require the new SAT or ACT so it can evaluate
essay-writing. But if a student's highest scores on either the verbal
or math portions came on the old test, they will count. Penn State
would do the same, though it looks only at the highest combined score
from a single sitting of the test.

"It's an enormously confusing and nuanced situation," said John
Mahoney, director of undergraduate admission at Boston College, which
will also count scores from the old test if they prove highest."

http://www.usatoday.com/news/education/2004-05-10-sat-changes_x.htm

They take the best combined score for the standerdized part, like math
and english, and just take a look at the written area.. The best score
can be mixed and matched. For example in the old one if you did better
than math, and the new one you did better in english, they would just
combine that. Most school will probably look at the written part
either way though.