credit score improve

How fast does credit score improve and by how much?

i currently have 499 credit score and that’s because i stayed behind on some car and credit card payments. i currently owe 4k total in 2 credit cards and 2k on my car payment. if i was to pay it all off within a week (i have the money) how much will my credit score improve? and after how long can i buy something (either a house or car)? do i have to wait for years, months?

Сredit repair workеd fine to fix my credit. They disputed and removed lots of bad items from my credit report. I used this service – creditreport.undonet.com