I got 110 for Toefl.
Speaking is the highest for me.
Its okay to say umm ahhh.. like that.. But dont pause too long..
Do not speak as if u r reading.. Use expressions too..
Just a quick tip=
1. State the overall problem / announcement
2. what do u think/ the man's opinion
3. reasons( give 1 or 2)
4. Elaborate
5. COnclusion ( Optional )
Even if u dont have an overall conclusion, if u give most of the points ready.. its a total fine..
SO, JUST BE FLEXIBLE AND SMOOTH AS FLOWING RIVERS.
Good Luck