Get a credit card with a high limit, keep the balance low and use the credit card to establish a credit history or boost a low credit score. Remember — the more available credit on a credit card, the better.
Having more than one credit account can boost your credit score. If possible, strive for at least three good accounts.
About How to Boost Your FICO Score
Good Credit Scores takes patience and persistence and there are quite a few ways to legitimately give your score a boost when needed. Over the long haul, you'll be rewarded with a solid FICO Score.