ICON+

I never knew that there are so many idioms to learn until I came to ICON+. Till this day I still use a lot of them in my life and I credit ICON+ for enriching my vocabulary and grammar. TOEFL2go is an excellent program and I would strongly recommend it as part of your TOEFL preparation. It contains 4 mock tests which were critical for simulating actual testing conditions. There are also plenty of vocabulary games that keep things fun and interesting.

Kudos to the entire ICON+ team for doing such a great job!