The practice materials are mostly Flash based and are interactive. They test a range of skills and grammar, and you get the results at the end as well as the chance to review your answers. Many cover listening skills with professional quality recordings for students to listen to.
I’ve just written one for the TOEFL reading paper based on a text about Robert Capa.
- You can try that out here
- You can listen to that here
- You can have a look at it here