Are they allowed to change their scores right before the submit them? I'm talking about the Oscar-Tito fight. If Oscar clearly won the first 9 rounds, then why would it have mattered that Oscar gave away the rest of the rounds? Oscar still would've won. So that means they changed the scores for the earlier rounds right when Oscar started throwing away some rounds.
They submit a score after each round. Following every round, the referee goes to each judge and collects their score on a small sheet of paper and hands it to someone.
No. They aren't allowed to change anything. For instance, the judge whose final card for the Pascal-Dawson fight was 118-111 actually had it 117-112 (he gave the last round to Pascal by mistake), and he couldn't do anything about it.