All of the following are free tools to you prepare for the sat except.
o
a. the online practice test.
o
b. the official sat online course.
c. the e-mailed sat question of the day.
d. sat skills insight.

The Official SAT online course is payable.

Explanation:

Some of the free tools are available to learn SAT. They are an online practice test, the e-mailed SAT questions and SAT skills insight. There are lots of online practice test are conducted by many websites. So many applications are also freely available to learn SAT. E-mailed SAT question and SAT skills insight are also free. But SAT online courses are payable. In this case, except SAT online course all the others are free.