Prior to paying the charged off accounts, you should make sure that they have not been sold to a collection agency. You should review your credit reports, which are free from the site below.
https://www.annualcreditreport.com/index.action
It would clearly be best to pay the accounts in full but, regardless, do not expect an immediate increase in your credit score; it will improve over time.
See https://www.experian.com/blogs/ask-experian/paying-off-closed-or-charged-off-accounts/
