<human>: Can you give me a shortened version of the text?

Back Story, I had absolutely no idea how credit worked, I wish there was required course in high school, or as a prerequisite to get credit. I was 22 and had a credit score of 490. WOW. I had always paid everything back, I was a lazy college student that didn't "get it". I started listening to Clark Howard and was like "ohhhhh, well I think I broke every rule". 

So I decided I would get my credit in shape, I got all my credit accounts (about 10) in good standing, and began paying on time every time and paid off all my debts. After about 2 years of doing everything perfectly and religiously I check again, and it was still down around 530, I had such a bad previous record of payment times, derogatory marks that even though I wasn't a risk in the slightest to any creditor (paid every single debt ever, including tons of late fees, made a good salary, and was not in debt) I couldn't get any credit. 

After another year my credit the creditors now started closing all my accounts, since they were paid off, or reducing my limits, actually lowering my credit down to 520. Even with another year of clean credit history. At this point I decided to do something not exactly honest since the system was stacked against me. I logged into every credit agency and contested every single derogatory mark and late mark. Writing made up explanations for each one. About 2/3rds of the marks were removed. Because the creditors either didn't respond, didn't contest or the creditor forgave the mark due to its age. 

Within a few months my credit score was up to 600. I was able to increase a few credit lines and it went up a little more. After another couple of years I contested all the remaining marks and all but one of them was removed. 

At 29, my credit score was at 750 and bought my home. It would have never happened this quickly had I not done this.
<bot>: Contest all derogatory marks on your credit score at all 3 agencies and they may get removed even if you were at fault.