is there a good software to re teach me math?

I am going to nursing school this fall and I really want to be flawless with calculating dosages and anything else that has to do with math in science and nursing. I havent had a math class in 5 years so i need to relearn a lot of things that I have forgotten. Instead of wasting my time and money spending an entire semester or more in college math classes, i would like to find some helpful software or prgrams that can teach math lessons and walk me through difficult equations. what should i do? Please help!

View this post on my blog: http://travelnursesuccess.com/is-there-a-good-software-to-re-teach-me-math