Let's set the rules before the plays: nothing legal changes your score overnight. Anyone promising '+100 points in a week' is selling you something — usually something that doesn't work or gets you in trouble.
BUT — and this is the part the scammers exploit — there ARE legitimate moves that show results in 30–90 days, because some scoring factors have no memory. Your score isn't a slow-moving average; parts of it recalculate every time your accounts report. This guide is the real speed manual.
Credit utilization — how much of your card limits you're using — is 30% of your score and recalculates with every statement. It has NO memory: fix it this month, score reflects it next month.
Roughly 1 in 5 credit reports contains an error, and bureaus must investigate disputes within about 30 days. File now, and corrections (and point recoveries) typically land inside 60 days.
1. Which of these actually moves a score within ~30 days?
2. A company promises to raise your score 150 points in 30 days, guaranteed. That's…
3. Becoming an authorized user on a trusted person's old, well-paid card…

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