If you're looking to improve your credit score, one of the best things you can do is to dispute questionable items on your credit report. The Fair Credit Reporting Act's (FCRA) Section 611 allows consumers to challenge inaccurate information on their credit reports.
This means that any negative or inaccurate information that the credit bureaus have for you can be disputed and, if removed, could result in a better credit score. Start filing your disputes with this secret letter right here.