Credit Karma recently launched the free Credit Report Card service that assigns letter grades to each component of your credit score. If you want to improve your credit score, try to bring up your performance in areas where you have low or failing grades. Not every component has the same bearing on your score, so underneath each section Credit Karma tells you how much weight it has. For those who look at their reports and scratch their head, the Credit Karma report card, which is drawn from your TransUnion report, makes understanding why your credit score is the way it is a snap. Full screen shot inside.