Ielts speaking--how to improve your bandscore

Chapter Three:
Brainstorming and relating ideas
How can brainstorming help in the Speaking tasks?
Since the Speaking test is impromptu, you should be ready and confident to
answer any question. This does not mean that you memorize or prepare some
rehearsed lines though.
Apart from familiarizing the types of question in the Speaking test, it is also a
wise idea to generate your own thoughts or views on any topic to be asked in the
actual test.
As you constantly brainstorm for ideas in the preparation period, you also
subconsciously master certain aspects of the language such as expressions,
common sentence patterns, and even your own distinct style of answering
questions.
Thus, preparation should yield more work for the brain. It is only with constant
and thorough practice that you truly become natural at sharing your ideas
verbally.