It may be possible to raise your credit score by 100 points in 30 days, but it depends on what's affecting your score. If you have errors on your credit report that have lowered your score, you might be able to improve your score very quickly by correcting them. Likewise, if there are one or two missed payments that have brought your score down, you could potentially raise your score quickly if you ask your creditors to remove those negative items. Some card issuers may be willing to do so if you've generally been a good customer. Asking someone with good credit to add you to their account as an authorized user could also help if you don't have much of a credit history of your own. And if any of your cards are maxed out, paying off the balances and reducing your credit utilization ratio could result in a credit score increase. But it's not always possible to take these steps, especially not this quickly. And if you have a long record of missed payments or maxed out cards and you can't fix those issues within 30 days, it will likely take more time and consistently responsible borrowing behavior over months or even years.