You have to practice more to achive a high score!
TOEFL Speaking Practice may help you to practice speaking questions.
There are about 200 speaking questions which are similar to TOEFL test.
(In this built, there are questions for only Speaking Test Question 1&2. For the next builts, other questions will be added)
You can find very usefull question tips, phrases and general information about the test.
Good luck on the actual exam.