Studying Biology and Chemistry for the SAT, And maybe AP tests out for a tenth Grader

<p>My sister wants to Study in the US and she is a brilliant student, so she wants to prepare for the SAT II Biology and Chemistry test.
What text books does she need?
is the Sat II biology prep book enough?
And will she be able to take the AP tests out side the US?
I know two websites that would be a lot of help for her the KhanAcademy and MIT open course ware, what do you think of them? I myself tried both of them an were amazing.
She wants to Study medicine, how is the procedure there to be a doctor and how long would it take?
Thanks very much</p>