Know your world
Do you think you have horrible pronunciation? You probably don't, but that is a concern for many students. How can you improve your pronunciation? Well, it's the same answer as most other questions... practice with a tutor. However, there are a few small things that you can do when you study English that will help you learn pronunciation.
Study English in English
(Languages that use different characters- Chinese, Japanese, Korean, Arabic, etc.)
A common mistake I often see people make when they study English is they will write the English word, but in their alphabet. The example above is in Korean. The Korean characters show the transliteration (the 'same' sound of the English words) of the English expressions. The only thing is, it's not the same. It's a little off, and that little bit of difference will make a BIG difference in your pronunciation down the road. Even if it's a little more work now, study and practice reading the words in English. The future you will thank you.
(Languages that use the same letters- Spanish, Italian, German, etc)
If you use the same alphabet as English, you don't have the same kinds of problems. Well done. However, I have seen some mistakes made by some of you that could be hurting your pronunciation as well.
One of my biggest and most basic suggestions is when you learn a new word, don't pronounce it as you would in your language. English isn't a very phonetic language.
A word like grape sounds like /greip/ with one syllable. It's not /gra-pei/ with two syllables. When you see, read, or write a new word, say it (in your head or out loud) correctly every time.
Remember, practice doesn't make perfect. Perfect practice makes perfect.
Transliteration (n) - the direct translation of the sounds of words between different languages.
To be a little off - there's something not quite right about that
Down the road - In the future
The future you will thank you - you will thank yourself in the future