To get the inaccurate marks off your credit history, you must request that the credit bureaus validate the information that you believe is inaccurate. Credit repair strategies also include sending cease-and-desist letters to debt collectors. Removing just a single negative item on your credit report can increase your credit score by more than 100 points.
If you find information that is incorrect, you can file a dispute. Remember too, that items on your credit report that you don't recognize could also be potential signs of fraudulent activity — someone working to secure credit in your name for their own use. Make sure you're clear on items that could potentially be fraudulent, versus those that may simply be inaccurate.