Getting negative and inaccurate information off of your credit reports is one of the fastest ways to see an improvement in your scores. Since credit bureaus have to respond and resolve a dispute within 30 days (there are a few exceptions that may extend this to 45 days), it’s a short timeline. Especially when consumers want to buy a house, get a new car, or open up a new credit card soon and don’t have the time to wait to build good credit in other ways.
Otherwise, the advice you have given is great and works well for a quick boost but having the ability to remove lines of information from your credit history is even better because once it is gone, it can no longer affect your score. BTW - don't take my word or anyone elses for that matter, educate yourself! You can find either of the sources I mentioned just by Googling either of them if you want and I promise you, the more information you have, the better!

A lot of creditors will easily forgive late payments if you only have 1 or 2.  All you need to do is call their customer service number and talk to one of their representatives.  Tell them what happened that month, that caused the payment to be made late (you were sick, your child was sick, you were out of town, you simply forgot).  As long as you are honest with them, and admit fault to the late payment, most creditors will want to continue to keep your business and remove the late payment for you.
I also don’t recommend trying this if you have missed payments with the issuer or have a downward-trending score. The issuer could see your request for a credit limit as a sign that you’re about to have a financial crisis and need the extra credit. I’ve actually seen this result in a decrease in credit limits. So be sure your situation looks stable before you ask for an increase.
Many people, however, don’t have the time or don’t understand how to make their case, so they look into hiring a credit repair company to dispute errors on their behalf. These companies can charge a fee for their legwork (more on how that works in a minute), but there are times when the extra help can certainly be welcome. (Say you have multiple errors across credit reports or you’ve been the victim of widespread identity theft.)
A good credit repair company will first pull your credit reports from each of the three major credit reporting agencies to pinpoint your credit issues. Why all three? Because each credit reporting agency has its own “data furnishers” (aka lenders, credit card companies, debt collectors, etc.), who report your credit information to them. And there may be errors that appear on one of your credit reports, but don’t appear on the others
Just as one example, the average age of your credit accounts is a component of this category. Let's say that you have four credit cards -- one that's a year old, two that you opened three years ago, and one that you opened 10 years ago but don't use anymore. Currently, your average credit card account is 4.25 years old. If you decided to close your old and unused account, however, this average would drop to just 2.33 years and could hurt your FICO score.
Do yourself a favor and save some money, too. Don’t believe these claims: they’re very likely signs of a scam. Indeed, attorneys at the Federal Trade Commission, the nation’s consumer protection agency, say they’ve never seen a legitimate credit repair operation making those claims. The fact is there’s no quick fix for creditworthiness. You can improve your credit report legitimately, but it takes time, a conscious effort, and sticking to a personal debt repayment plan.

A report by FICO® showed that younger consumers can earn high credit scores with excellent credit behavior. 93% of consumers with credit scores between 750 and 799 who were under age 29 never had a late payment on their credit report. In contrast, 57% of the total population had at least one delinquency. This good credit group also used less of their available credit. They had an average revolving credit utilization ratio of 6%. The nation as a whole had a utilization ratio of 15%.39
Radio, television and the internet are full of ads for credit-repair services promising to make your credit problems go away. It's not that easy. Be very wary of for-profit-credit-repair services. These ultimately just add to your expenses and, in the case of debt management services, may cause you to lose control of when and whether payments are actually reaching your creditors.
Leading up to the credit score crash — You lost your job and used credit cards to pay expenses. You are overburdened with five maxed out credit cards at $5,000 each, for a total debt load of $25,000. You stopped paying them all for six months so they’ve grown to $30,000 with interest included and a balance of $6,000 each. You have 100% utilization and a terrible credit score of 450. As a last resort, you take out a $14,000 loan from your 401(k) and start calling creditors to negotiate.

If you don’t want to go through the effort of fixing errors yourself, you can also hire a credit repair company to send fix requests on your behalf. Keep in mind that credit repair companies might try to convince you to try other ways to fix your credit, but you are paying by the month, so make sure they are focusing on your errors. Here are the two best credit repair companies compared side by side.
Shortly before graduate school started, I visited friends in Iowa. When we were about to split the bill after dinner at a Japanese restaurant, I noticed that all my friends had a Discover card with a shimmering pink or blue cover. The Discover it® Student Cash Back was known for its high approval rate for student applicants, and had been popular among international students. 
The mix of credit you have is 10% of your credit score. The credit-scoring model favors people who have both revolving lines of credit (credit cards) and installment credit (auto loans and mortgages), or a “mix” of the two types of credit.   If you only have credit cards listed on your credit report, this can hurt your score. Consider applying for an auto loan or a mortgage, and make sure the lender will report the account to the credit bureaus.
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