Well, for one thing, you must try to be fully understand what the lecturer is trying to tell you, the lecture lasts around 2 minutes, take note of the points, I think most lectures have 3 points only that mostly are contradicted to the points in the reading. After you fully understand the lecture, what you need is just simply write a clear structure on your own, and apply the points in listening and reading into the structure.it should not be so hard. As to speaking, I don't really have a lot of advices on that, simply keep practising, Keep speaking without any pauses. And of course getting the points in the lecture is very essential.
Listening is everything in the new generation TOEFl.
Good luck with it lol~~