how to improve wpm massively?

please don't laugh. well, okay, maybe you can giggle. my current wpm is 8. YES, 8. with 94% accuracy. all of my friends type really well, from 75-125 wpm, and I have 8. in my defense, I learned typing wrong for the first 13 yrs of my life and had to relearn it, but I'm in computer science classes and I DESPERATELY need to get that number up to at least 75. how can I improve well, and fast? how much will I be improving? any recommended typing sites to learn on? edit: went on monkeytype and tested again using correct typing method and I got 20 wpm!