My online speed maximum only have 512kbps… means divide by 8. The total of my download speed in bitcomet is 64kbps… but I download a torrent file (Is a korean drama) and it almost reach to 90~110kbps speed !! This very suriprise me !! anything affecting my download speed ?
Congratulations.
I’m going to comment each your phrase, so consider following to be “commented quote” 
My online speed maximum only have 512kbps… means divide by 8.
and you’ll get your speed in kilobytes per second aka kB/s.
The total of my download speed in bitcomet is 64kbps…
Note: BitComet uses “KB/s” (not literally right though). If you got 64 by dividing, then you should use kB/s instead of kilobits per sec aka kbps aka kb/s aka kbit/s.
but I download a torrent file (Is a korean drama) and it almost reach to 90~110kbps speed !!
Nice. Divide it by 8 and get your 11.25-13.75 kB/s out of your 64kB/s.
This very suriprise me !! anything affecting my download speed ?
Start from checking this Wikipedia article not to be too much surprised in the future 