TOEFL writing

Hello, dear users and moderators of EnglishForward.com!
I'm preparing for the TOEFL iBT and have some difficulties with writing and speaking sections. I have heard that there are some forums like this that provides writing correction which is free of charge.

So, can anybody answer me, where are those forums or web-sites?

And where can I find same service (it might be paid) for the speaking tasks?

Thanks a lot!
P.S.: I'm sorry, if off-topic