My English looks obviously improved

Recently my english looks much improved.

Following items are what I am doing to improve my English, recently.

• Reading one English article with speaking (Morning and night). Repeat 3 times for one article.

• Listen and watch to BBC News live video (Night)

Maybe "Live" button to watch the live video is appeared only when it is accessed from UK area.
http://www.bbc.co.uk/news

• Stopped to speak Japanese. (I still have a chance to write Japanese)

• English lesson with teacher 90 mins per day.

• Listen the voice for English listening training.

• What I came to UK.

I have not been able to specify the reason why I could improve it.