How do you typically figure a score? Usually it is a percent --
(# correct / total number of questions) x 100.
So your question boils down to this -
Test#1 60 correct out of 80 total questions= (60/80) times 100
Test #2 75 correct out of 100 total questions = (75/100) times 100
You don't even need a calculator -- can you reduce those fractions? That's all you need to do to see what this answer is.
Math word problems are often is a matter of taking a moment to understand the story, and then simply writing down exactly what it says. Too many students rush or try to guess how can shove the given numbers into some equation. Wrong, wrong, wrong. Always focus first on the STORY, no the numbers - and see if the STORY is telling you how to put the numbers together, or what equation to use.