The way I got there was by practicing accuracy first since the speed will come with time. I skip loads of quotes, whenever I make a mistake. And I don't try to go fast, I just focus on accuracy. Over time, my wpm has improved with this strategy so I guess just be accurate and be patient. Good luck!

EDIT: If you look at the speed over time graph on my profile, you can see where I stopped trying to go fast and started going for accuracy :)

Do you think skipping quotes is a good thing? I am aleady typing short quotes at 90 but, whenever the text is long my speed drops.

I skip because it gives me an incentive to type more accurately. Since I'm playing to improve my typing (which I assume you are too), and accuracy is more important than speed (this seems to be the general consensus, and accuracy is a prerequisite to speed anyways), I practice for accuracy. I don't think skipping quotes is a bad thing, because all it does is make it easier to go faster. Since we aren't trying to go faster, then its totally fine. I skip when I mess up, but will try my hand at any quote that comes at me. Its essentially manual instant death mode from TypeRacer.

I think skipping quotes is a good idea when you've properly messed up. It's better to cut your losses then potentially make even more mistakes correcting the first one and developing catastrophic habits out of correcting those mistakes. If you're always correcting mistakes instead of actually typing, there's a chance you'll make a habit out of that process and a habit like that would be absolutely dreadful.

That's my take on it, anyway.
-Kaiser