What's the difference between using µt and BC?
Ratio is a figure indicating the amount of upload with respect to your download. In order to get a good ratio, you have to minimize your download and maximize your upload. A good way to ensure good ratio is to seek ways to upload before you try to download. One method is to download "golden torrents" or "free torrents". There are many threads for you to learn here, read carefully before you try to download anything.