1) Listen to BBC news daily 20 to 30 min:- this will help to improve your english(listening and peaking both)
2) Start writing a blog:- this will improve your English writing skills.
3) Read newspaper editorial
4) Practice - Practice and Practice - Create a group of like minded friends and discuss various topics in english.

Check this link to get the interview tips:-

http://www.prac-career.blogspot.in/2013/06/how-to-prepare-for-your-first-job.html

Stay Positive and Keep Learning,
Vikram
http://www.praclabs.com

Practice makes a man perfect. Focus on four things
1. Reading
2. Writing
3. Speaking
4. Listening

Practice all four things as much as possible and you will improve in no time. All the best