There are numerous resources available online to help you hone your listening skills.
BBC World Service is an excellent choice, and one of my favourite things is the short new bulletins they have on their website.
Listen as you commute on the bus to and from work, during your lunch break, or whenever you have a spare 5 – 10 minutes. The newsreaders have a variety of accents so you can also practice tuning in to that too.
Try making it part of your daily routine and see what improvement you make.