Case 1 : "My mother thought that I was the least intelligent of all the pupils in my class, but she was wrong. I was good at history and even better at maths."
Case 2:
"My mother thought that I was the least intelligent of all the pupils in my class, but she was wrong. I was better at history and even more good at maths."
In this structure I can feel that the speaker is making a comparison with his classmates finding himself better at history, and then using 'more' to modify up his capability at math in comparison with his in history.
Top answer
The adjectival construction *more good = better They both mean the same thing. We always substitute better for *more good . *more good is considered ungrammatical.
— CalifJim
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The adjectival construction *more good = better They both mean the same thing. We always substitute better for *more good. *more good is considered ungrammatical. So Case 2 is incorrect. more good is correct only when good is a noun: I hope we are doing more good than harm. CJ