Raising credit score!?

Okay... I'm 21. And my scores are: 573, 629, and 565. I have one collection on my report, but it was paid off in 2007. I just closed my very first credit card like a month ago since I didn't want to pay the new annual fee of $150. And I have 2 current credit cards that have a combined limit of $800. I want... show more Okay... I'm 21. And my scores are: 573, 629, and 565. I have one collection on my report, but it was paid off in 2007. I just closed my very first credit card like a month ago since I didn't want to pay the new annual fee of $150. And I have 2 current credit cards that have a combined limit of $800. I want to raise my credit score fast. What should I do? Or should I just keep using my cards and paying the minimum payments? What would be the best thing for me to do? I want to buy a car in about 3 years. Thanks!
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