What is the best way to increase my typing speed by Wednesday?

I am going to a temp agency next Wednesday and I will be taking a typing test. Thing is, I do not know how to type correctly. I never learned. I have my own way of typing, but my speed and accuracy with “my kind of typing” is only good when I am typing my own thoughts (at least 40–45 wpm). When I am trying to copy something, my typing is really not much better than hunting and pecking and I make a lot of mistakes. I have to look at the keyboard or I can’t type. It’s just how it is.

So I ask, should I practice my own way of typing to try and make it faster or should I try the myriad of practice games and such that are on the internet and begin to learn the correct way to type?

Usually these tests consist of them giving you a piece of writing to copy. My typical strategy for these is to remember one sentence at a time and type it, and so on.

What do you think. What is my best option?