Good Guides for TOEFL® - returning Older Adult and Mother?

[MonkeyGurl]

Hey,

My mom (in her mid fifties - yes she wants to go back to school!) decided she wants to basically go back to school, match her credentials and get a masters (and who knows what then).

But in order to do so, she needs the TOEFFL. Now here's the thing, my mom is a FOREIGN graduate so English is not her first language. She speaks fine but lacks in the "grammar" compartment. She is also a working mom. So I'm trying to find the easiest way out for her (hoping).

So my questions are

1- Approximately how long does she need to study for this test?
2- Any good guides/book/online courses... preferably condensed ones because she will start working again at the end of this month (videos/visual are probably her best bet I THINK - 'cause pure text might not be the best thing oO?)
3- How hard is it?

Any other things I should tell her or be aware of. Thanks and would really appreciate anything I could get!

TOEFL listening lectures: A university lecture on Animal Behavior by a professor of Biology