This is what I recommend you to study english.
When i was in Canada, i used to study english at the following site.
1. Go to the website
2. Begin with "Short on-line dictations."
- Click A to listen first at normal speed. Do not write anything yet.
- Click B Listen at slow speed and type what you hear in Box C.
- Click D to listen @ normal speed again and make corrections in Box C.
- Click F to see the transcript and correct your dictation.
Finish all the Short dictations.
3. Do the "medium on-line dictations."