I moved to the US 15 years ago. I thought my English was good (A+ in every exam I ever took), but I was sadly mistaken. Thankfully it didn't prevent me from get

I moved to the US 15 years ago. I thought my English was good (A+ in every exam I ever took), but I was sadly mistaken. Thankfully it didn't prevent me from getting jobs. It took me about 2-3 years to get truly fluent. Get out there, speak English with everyone, get yourself in uncomfortable situations, immerse yourself in the language completely. That's the only way to really get it. I think Pitarou's answer is spot on, if you need to improve the language skills in a short time though.