Credit scores will take awhile to rebuild and I've never known of anyway to get the credit score up real fast unless you hire a lawyer and pay a bunch of fees to a credit repair company.
A good way to help boost your credit score is by getting a secured credit card through capital one credit card company or through any other company and use the credit card responsibly and pay the credit card bills promptly and try to pay more then the minimum payment.
Use the limit and then pay the balance off in full if possible.
Using the secured credit card responsibly will help boost your credit score overtime.
To get a secured credit card through capital one or other credit card companies you'll need to put up a deposit of around $200.00 to secure the credit card.